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15x+27(x-3)=507
We move all terms to the left:
15x+27(x-3)-(507)=0
We multiply parentheses
15x+27x-81-507=0
We add all the numbers together, and all the variables
42x-588=0
We move all terms containing x to the left, all other terms to the right
42x=588
x=588/42
x=14
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