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12+3(x-3)=100
We move all terms to the left:
12+3(x-3)-(100)=0
We add all the numbers together, and all the variables
3(x-3)-88=0
We multiply parentheses
3x-9-88=0
We add all the numbers together, and all the variables
3x-97=0
We move all terms containing x to the left, all other terms to the right
3x=97
x=97/3
x=32+1/3
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