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20=40+5x
We move all terms to the left:
20-(40+5x)=0
We add all the numbers together, and all the variables
-(5x+40)+20=0
We get rid of parentheses
-5x-40+20=0
We add all the numbers together, and all the variables
-5x-20=0
We move all terms containing x to the left, all other terms to the right
-5x=20
x=20/-5
x=-4
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