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-8=3x-20
We move all terms to the left:
-8-(3x-20)=0
We get rid of parentheses
-3x+20-8=0
We add all the numbers together, and all the variables
-3x+12=0
We move all terms containing x to the left, all other terms to the right
-3x=-12
x=-12/-3
x=+4
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