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12(8x+12)=21
We move all terms to the left:
12(8x+12)-(21)=0
We multiply parentheses
96x+144-21=0
We add all the numbers together, and all the variables
96x+123=0
We move all terms containing x to the left, all other terms to the right
96x=-123
x=-123/96
x=-1+9/32
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