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20(x-9)=12
We move all terms to the left:
20(x-9)-(12)=0
We multiply parentheses
20x-180-12=0
We add all the numbers together, and all the variables
20x-192=0
We move all terms containing x to the left, all other terms to the right
20x=192
x=192/20
x=9+3/5
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