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4x+12(x-3)=20
We move all terms to the left:
4x+12(x-3)-(20)=0
We multiply parentheses
4x+12x-36-20=0
We add all the numbers together, and all the variables
16x-56=0
We move all terms containing x to the left, all other terms to the right
16x=56
x=56/16
x=3+1/2
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