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(2x)+(20)=(6x)-(12)
We move all terms to the left:
(2x)+(20)-((6x)-(12))=0
We get rid of parentheses
2x-6x+12+20=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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