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3.5=x0.2
We move all terms to the left:
3.5-(x0.2)=0
We add all the numbers together, and all the variables
-(+x0.2)+3.5=0
We get rid of parentheses
-x0.2+3.5=0
We move all terms containing x to the left, all other terms to the right
-x0.2=-3.5
x=-3.5/1
x=-3.5
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