15=-x-4x

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Solution for 15=-x-4x equation: 



15=-x-4x

We move all terms to the left:

15-(-x-4x)=0

We add all the numbers together, and all the variables

-(-5x)+15=0

We get rid of parentheses

5x+15=0

We move all terms containing x to the left, all other terms to the right

5x=-15

x=-15/5

x=-3

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