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3.12=0.39x
We move all terms to the left:
3.12-(0.39x)=0
We add all the numbers together, and all the variables
-(+0.39x)+3.12=0
We get rid of parentheses
-0.39x+3.12=0
We move all terms containing x to the left, all other terms to the right
-0.39x=-3.12
x=-3.12/-0.39
x=+8
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