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40(x-2)=30x
We move all terms to the left:
40(x-2)-(30x)=0
We add all the numbers together, and all the variables
-30x+40(x-2)=0
We multiply parentheses
-30x+40x-80=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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