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5x+5(3x+-12)=20
We move all terms to the left:
5x+5(3x+-12)-(20)=0
We add all the numbers together, and all the variables
5x+5(3x-12)-20=0
We multiply parentheses
5x+15x-60-20=0
We add all the numbers together, and all the variables
20x-80=0
We move all terms containing x to the left, all other terms to the right
20x=80
x=80/20
x=4
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