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5x+12=2x-66
We move all terms to the left:
5x+12-(2x-66)=0
We get rid of parentheses
5x-2x+66+12=0
We add all the numbers together, and all the variables
3x+78=0
We move all terms containing x to the left, all other terms to the right
3x=-78
x=-78/3
x=-26
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