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9(3x+6)+6(7x-3)=12
We move all terms to the left:
9(3x+6)+6(7x-3)-(12)=0
We multiply parentheses
27x+42x+54-18-12=0
We add all the numbers together, and all the variables
69x+24=0
We move all terms containing x to the left, all other terms to the right
69x=-24
x=-24/69
x=-8/23
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