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12x-6x-168=12x+90
We move all terms to the left:
12x-6x-168-(12x+90)=0
We add all the numbers together, and all the variables
6x-(12x+90)-168=0
We get rid of parentheses
6x-12x-90-168=0
We add all the numbers together, and all the variables
-6x-258=0
We move all terms containing x to the left, all other terms to the right
-6x=258
x=258/-6
x=-43
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