15=-x-3x

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Solution for 15=-x-3x equation: 



15=-x-3x

We move all terms to the left:

15-(-x-3x)=0

We add all the numbers together, and all the variables

-(-4x)+15=0

We get rid of parentheses

4x+15=0

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

4x=-15

x=-15/4

x=-3+3/4

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