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1x+40=2x-40
We move all terms to the left:
1x+40-(2x-40)=0
We add all the numbers together, and all the variables
x-(2x-40)+40=0
We get rid of parentheses
x-2x+40+40=0
We add all the numbers together, and all the variables
-1x+80=0
We move all terms containing x to the left, all other terms to the right
-x=-80
x=-80/-1
x=+80
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