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6x+6(-7x-21)=162
We move all terms to the left:
6x+6(-7x-21)-(162)=0
We multiply parentheses
6x-42x-126-162=0
We add all the numbers together, and all the variables
-36x-288=0
We move all terms containing x to the left, all other terms to the right
-36x=288
x=288/-36
x=-8
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