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40=x0.3
We move all terms to the left:
40-(x0.3)=0
We add all the numbers together, and all the variables
-(+x0.3)+40=0
We get rid of parentheses
-x0.3+40=0
We move all terms containing x to the left, all other terms to the right
-x0.3=-40
x=-40/1
x=-40
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