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9(7x+2)=12
We move all terms to the left:
9(7x+2)-(12)=0
We multiply parentheses
63x+18-12=0
We add all the numbers together, and all the variables
63x+6=0
We move all terms containing x to the left, all other terms to the right
63x=-6
x=-6/63
x=-2/21
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