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12x+8=2x+78
We move all terms to the left:
12x+8-(2x+78)=0
We get rid of parentheses
12x-2x-78+8=0
We add all the numbers together, and all the variables
10x-70=0
We move all terms containing x to the left, all other terms to the right
10x=70
x=70/10
x=7
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