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3x+3(x+14)=510
We move all terms to the left:
3x+3(x+14)-(510)=0
We multiply parentheses
3x+3x+42-510=0
We add all the numbers together, and all the variables
6x-468=0
We move all terms containing x to the left, all other terms to the right
6x=468
x=468/6
x=78
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