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2(x-1)+8=4x-20
We move all terms to the left:
2(x-1)+8-(4x-20)=0
We multiply parentheses
2x-(4x-20)-2+8=0
We get rid of parentheses
2x-4x+20-2+8=0
We add all the numbers together, and all the variables
-2x+26=0
We move all terms containing x to the left, all other terms to the right
-2x=-26
x=-26/-2
x=+13
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