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20=2x+40
We move all terms to the left:
20-(2x+40)=0
We get rid of parentheses
-2x-40+20=0
We add all the numbers together, and all the variables
-2x-20=0
We move all terms containing x to the left, all other terms to the right
-2x=20
x=20/-2
x=-10
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