-15x-57=-8x+90

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Solution for -15x-57=-8x+90 equation: 



-15x-57=-8x+90

We move all terms to the left:

-15x-57-(-8x+90)=0

We get rid of parentheses

-15x+8x-90-57=0

We add all the numbers together, and all the variables

-7x-147=0

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

-7x=147

x=147/-7

x=-21

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