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-4x-66=-8x+18
We move all terms to the left:
-4x-66-(-8x+18)=0
We get rid of parentheses
-4x+8x-18-66=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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