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3-20=x+20
We move all terms to the left:
3-20-(x+20)=0
We add all the numbers together, and all the variables
-(x+20)-17=0
We get rid of parentheses
-x-20-17=0
We add all the numbers together, and all the variables
-1x-37=0
We move all terms containing x to the left, all other terms to the right
-x=37
x=37/-1
x=-37
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