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5x-12(3x+30)=40
We move all terms to the left:
5x-12(3x+30)-(40)=0
We multiply parentheses
5x-36x-360-40=0
We add all the numbers together, and all the variables
-31x-400=0
We move all terms containing x to the left, all other terms to the right
-31x=400
x=400/-31
x=-12+28/31
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