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12(x-3)=90
We move all terms to the left:
12(x-3)-(90)=0
We multiply parentheses
12x-36-90=0
We add all the numbers together, and all the variables
12x-126=0
We move all terms containing x to the left, all other terms to the right
12x=126
x=126/12
x=10+1/2
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