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-8x+54=4x-66

We move all terms to the left:

-8x+54-(4x-66)=0

We get rid of parentheses

-8x-4x+66+54=0

We add all the numbers together, and all the variables

-12x+120=0

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

-12x=-120

x=-120/-12

x=+10

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