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6x+12=2x-20
We move all terms to the left:
6x+12-(2x-20)=0
We get rid of parentheses
6x-2x+20+12=0
We add all the numbers together, and all the variables
4x+32=0
We move all terms containing x to the left, all other terms to the right
4x=-32
x=-32/4
x=-8
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