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42=x.5
We move all terms to the left:
42-(x.5)=0
We add all the numbers together, and all the variables
-(+x.5)+42=0
We get rid of parentheses
-x.5+42=0
We move all terms containing x to the left, all other terms to the right
-x.5=-42
x=-42/1
x=-42
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