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12x-3(2x+3)=7
We move all terms to the left:
12x-3(2x+3)-(7)=0
We multiply parentheses
12x-6x-9-7=0
We add all the numbers together, and all the variables
6x-16=0
We move all terms containing x to the left, all other terms to the right
6x=16
x=16/6
x=2+2/3
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