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13=x.0
We move all terms to the left:
13-(x.0)=0
We add all the numbers together, and all the variables
-(+x.0)+13=0
We get rid of parentheses
-x.0+13=0
We move all terms containing x to the left, all other terms to the right
-x.0=-13
x=-13/1
x=-13
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