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6x-2(-5x-21)=-54-8x
We move all terms to the left:
6x-2(-5x-21)-(-54-8x)=0
We add all the numbers together, and all the variables
6x-2(-5x-21)-(-8x-54)=0
We multiply parentheses
6x+10x-(-8x-54)+42=0
We get rid of parentheses
6x+10x+8x+54+42=0
We add all the numbers together, and all the variables
24x+96=0
We move all terms containing x to the left, all other terms to the right
24x=-96
x=-96/24
x=-4
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