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12(x-30)=75
We move all terms to the left:
12(x-30)-(75)=0
We multiply parentheses
12x-360-75=0
We add all the numbers together, and all the variables
12x-435=0
We move all terms containing x to the left, all other terms to the right
12x=435
x=435/12
x=36+1/4
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