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