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(x-3)+(2x+8)=4x-4
We move all terms to the left:
(x-3)+(2x+8)-(4x-4)=0
We get rid of parentheses
x+2x-4x-3+8+4=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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