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40+x+40=6x+20
We move all terms to the left:
40+x+40-(6x+20)=0
We add all the numbers together, and all the variables
x-(6x+20)+80=0
We get rid of parentheses
x-6x-20+80=0
We add all the numbers together, and all the variables
-5x+60=0
We move all terms containing x to the left, all other terms to the right
-5x=-60
x=-60/-5
x=+12
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