-(x+15)=-3x=3x

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Solution for -(x+15)=-3x=3x equation: 



-(x+15)=-3x=3x

We move all terms to the left:

-(x+15)-(-3x)=0

We get rid of parentheses

-x+3x-15=0

We add all the numbers together, and all the variables

2x-15=0

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

2x=15

x=15/2

x=7+1/2

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