# Shorthand operations in JavaScript

For such operations, when to the variable its current value plus something else is written, there is a special shortened syntax. This syntax uses the special operator `+=` instead of the normal assignment. Let's look at an example:

`let num = 1; num += 3; // equivalent to num = num + 3;`

There are similar operators for other mathematical operations:

`let num = 2; num -= 3; // equivalent to num = num - 3;`
`let num = 2; num *= 3; // equivalent to num = num * 3;`
`let num = 2; num /= 3; // equivalent to num = num / 3;`

Modify this code to use the above described shorthand operations:

`let num = 47; num = num + 7; num = num - 18; num = num * 10; num = num / 15; alert(num);`
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