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30(x+2)=40x
We move all terms to the left:
30(x+2)-(40x)=0
We add all the numbers together, and all the variables
-40x+30(x+2)=0
We multiply parentheses
-40x+30x+60=0
We add all the numbers together, and all the variables
-10x+60=0
We move all terms containing x to the left, all other terms to the right
-10x=-60
x=-60/-10
x=+6
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