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(61+20)=400+20x
We move all terms to the left:
(61+20)-(400+20x)=0
We add all the numbers together, and all the variables
-(20x+400)+81=0
We get rid of parentheses
-20x-400+81=0
We add all the numbers together, and all the variables
-20x-319=0
We move all terms containing x to the left, all other terms to the right
-20x=319
x=319/-20
x=-15+19/20
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