-7x=8x+90

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Solution for -7x=8x+90 equation: 



-7x=8x+90

We move all terms to the left:

-7x-(8x+90)=0

We get rid of parentheses

-7x-8x-90=0

We add all the numbers together, and all the variables

-15x-90=0

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

-15x=90

x=90/-15

x=-6

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