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39(x+15)=42
We move all terms to the left:
39(x+15)-(42)=0
We multiply parentheses
39x+585-42=0
We add all the numbers together, and all the variables
39x+543=0
We move all terms containing x to the left, all other terms to the right
39x=-543
x=-543/39
x=-13+12/13
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