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40=x+0.30(x)
We move all terms to the left:
40-(x+0.30(x))=0
We add all the numbers together, and all the variables
-(+1.3x)+40=0
We get rid of parentheses
-1.3x+40=0
We move all terms containing x to the left, all other terms to the right
-1.3x=-40
x=-40/-1.3
x=30+1/1.3
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