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27=2x+20
We move all terms to the left:
27-(2x+20)=0
We get rid of parentheses
-2x-20+27=0
We add all the numbers together, and all the variables
-2x+7=0
We move all terms containing x to the left, all other terms to the right
-2x=-7
x=-7/-2
x=3+1/2
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