-x+7-3x=15

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Solution for -x+7-3x=15 equation: 



-x+7-3x=15

We move all terms to the left:

-x+7-3x-(15)=0

We add all the numbers together, and all the variables

-4x-8=0

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

-4x=8

x=8/-4

x=-2

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