-3x+7x-8x=84

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Solution for -3x+7x-8x=84 equation: 



-3x+7x-8x=84

We move all terms to the left:

-3x+7x-8x-(84)=0

We add all the numbers together, and all the variables

-4x-84=0

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

-4x=84

x=84/-4

x=-21

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