-4x=84+8x

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Solution for -4x=84+8x equation: 



-4x=84+8x

We move all terms to the left:

-4x-(84+8x)=0

We add all the numbers together, and all the variables

-4x-(8x+84)=0

We get rid of parentheses

-4x-8x-84=0

We add all the numbers together, and all the variables

-12x-84=0

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

-12x=84

x=84/-12

x=-7

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