freeCodeCamp/curriculum/challenges/portuguese/02-javascript-algorithms-an.../basic-javascript/compound-assignment-with-au...

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---
id: 56533eb9ac21ba0edf2244b0
title: Compound Assignment With Augmented Subtraction
challengeType: 1
videoUrl: ''
localeTitle: Atribuição Composta com Subtração Aumentada
---
## Description
<section id="description"> Como o operador <code>+=</code> , <code>-=</code> subtrai um número de uma variável. <code>myVar = myVar - 5;</code> subtrairá <code>5</code> do <code>myVar</code> . Isso pode ser reescrito como: <code>myVar -= 5;</code> </section>
## Instructions
<section id="instructions"> Converta as atribuições de <code>a</code> , <code>b</code> e <code>c</code> para usar o operador <code>-=</code> . </section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>a</code> deve igual a <code>5</code>
testString: 'assert(a === 5, "<code>a</code> should equal <code>5</code>");'
- text: <code>b</code> deve ser igual a <code>-6</code>
testString: 'assert(b === -6, "<code>b</code> should equal <code>-6</code>");'
- text: <code>c</code> deve ser igual a <code>2</code>
testString: 'assert(c === 2, "<code>c</code> should equal <code>2</code>");'
- text: Você deve usar o operador <code>-=</code> para cada variável
testString: 'assert(code.match(/-=/g).length === 3, "You should use the <code>-=</code> operator for each variable");'
- text: Não modifique o código acima da linha
testString: 'assert(/var a = 11;/.test(code) && /var b = 9;/.test(code) && /var c = 3;/.test(code), "Do not modify the code above the line");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
var a = 11;
var b = 9;
var c = 3;
// Only modify code below this line
a = a - 6;
b = b - 15;
c = c - 1;
```
</div>
### After Test
<div id='js-teardown'>
```js
console.info('after the test');
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>