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12(x+30.5)=15x-84
We move all terms to the left:
12(x+30.5)-(15x-84)=0
We multiply parentheses
12x-(15x-84)+366=0
We get rid of parentheses
12x-15x+84+366=0
We add all the numbers together, and all the variables
-3x+450=0
We move all terms containing x to the left, all other terms to the right
-3x=-450
x=-450/-3
x=+150
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