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5(4x+12)=40
We move all terms to the left:
5(4x+12)-(40)=0
We multiply parentheses
20x+60-40=0
We add all the numbers together, and all the variables
20x+20=0
We move all terms containing x to the left, all other terms to the right
20x=-20
x=-20/20
x=-1
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