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80(x+30)=140x
We move all terms to the left:
80(x+30)-(140x)=0
We add all the numbers together, and all the variables
-140x+80(x+30)=0
We multiply parentheses
-140x+80x+2400=0
We add all the numbers together, and all the variables
-60x+2400=0
We move all terms containing x to the left, all other terms to the right
-60x=-2400
x=-2400/-60
x=+40
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