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3x-6(3+7-2x)=0
We add all the numbers together, and all the variables
3x-6(-2x+10)=0
We multiply parentheses
3x+12x-60=0
We add all the numbers together, and all the variables
15x-60=0
We move all terms containing x to the left, all other terms to the right
15x=60
x=60/15
x=4
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