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12x-10=4x+39
We move all terms to the left:
12x-10-(4x+39)=0
We get rid of parentheses
12x-4x-39-10=0
We add all the numbers together, and all the variables
8x-49=0
We move all terms containing x to the left, all other terms to the right
8x=49
x=49/8
x=6+1/8
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