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12x+30(x+2)=144
We move all terms to the left:
12x+30(x+2)-(144)=0
We multiply parentheses
12x+30x+60-144=0
We add all the numbers together, and all the variables
42x-84=0
We move all terms containing x to the left, all other terms to the right
42x=84
x=84/42
x=2
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