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(3x-30)+3x=360
We move all terms to the left:
(3x-30)+3x-(360)=0
We add all the numbers together, and all the variables
3x+(3x-30)-360=0
We get rid of parentheses
3x+3x-30-360=0
We add all the numbers together, and all the variables
6x-390=0
We move all terms containing x to the left, all other terms to the right
6x=390
x=390/6
x=65
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