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3(5x+6)-3(2x+4)=12
We move all terms to the left:
3(5x+6)-3(2x+4)-(12)=0
We multiply parentheses
15x-6x+18-12-12=0
We add all the numbers together, and all the variables
9x-6=0
We move all terms containing x to the left, all other terms to the right
9x=6
x=6/9
x=2/3
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