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40=0.3x
We move all terms to the left:
40-(0.3x)=0
We add all the numbers together, and all the variables
-(+0.3x)+40=0
We get rid of parentheses
-0.3x+40=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-40
x=-40/-0.3
x=133+0.1/0.3
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