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20=5x-7
We move all terms to the left:
20-(5x-7)=0
We get rid of parentheses
-5x+7+20=0
We add all the numbers together, and all the variables
-5x+27=0
We move all terms containing x to the left, all other terms to the right
-5x=-27
x=-27/-5
x=5+2/5
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