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13800=x.50
We move all terms to the left:
13800-(x.50)=0
We add all the numbers together, and all the variables
-(+x.50)+13800=0
We get rid of parentheses
-x.50+13800=0
We move all terms containing x to the left, all other terms to the right
-x.50=-13800
x=-13800/1
x=-13800
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