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12x-6x+198=12x+120
We move all terms to the left:
12x-6x+198-(12x+120)=0
We add all the numbers together, and all the variables
6x-(12x+120)+198=0
We get rid of parentheses
6x-12x-120+198=0
We add all the numbers together, and all the variables
-6x+78=0
We move all terms containing x to the left, all other terms to the right
-6x=-78
x=-78/-6
x=+13
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