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20+2x=4x-8
We move all terms to the left:
20+2x-(4x-8)=0
We get rid of parentheses
2x-4x+8+20=0
We add all the numbers together, and all the variables
-2x+28=0
We move all terms containing x to the left, all other terms to the right
-2x=-28
x=-28/-2
x=+14
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