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5x=2x-12=16
We move all terms to the left:
5x-(2x-12)=0
We get rid of parentheses
5x-2x+12=0
We add all the numbers together, and all the variables
3x+12=0
We move all terms containing x to the left, all other terms to the right
3x=-12
x=-12/3
x=-4
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