-15=4x+x

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Solution for -15=4x+x equation: 



-15=4x+x

We move all terms to the left:

-15-(4x+x)=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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