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20=8x-4x
We move all terms to the left:
20-(8x-4x)=0
We add all the numbers together, and all the variables
-(+4x)+20=0
We get rid of parentheses
-4x+20=0
We move all terms containing x to the left, all other terms to the right
-4x=-20
x=-20/-4
x=+5
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