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20=x.200
We move all terms to the left:
20-(x.200)=0
We add all the numbers together, and all the variables
-(+x.200)+20=0
We get rid of parentheses
-x.200+20=0
We move all terms containing x to the left, all other terms to the right
-x.200=-20
x=-20/1
x=-20
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