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12x-6x+186=12x+78
We move all terms to the left:
12x-6x+186-(12x+78)=0
We add all the numbers together, and all the variables
6x-(12x+78)+186=0
We get rid of parentheses
6x-12x-78+186=0
We add all the numbers together, and all the variables
-6x+108=0
We move all terms containing x to the left, all other terms to the right
-6x=-108
x=-108/-6
x=+18
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