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X-40=4X+40
We move all terms to the left:
X-40-(4X+40)=0
We get rid of parentheses
X-4X-40-40=0
We add all the numbers together, and all the variables
-3X-80=0
We move all terms containing X to the left, all other terms to the right
-3X=80
X=80/-3
X=-26+2/3
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