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(3x+3x)=15
We move all terms to the left:
(3x+3x)-(15)=0
We add all the numbers together, and all the variables
(+6x)-15=0
We get rid of parentheses
6x-15=0
We move all terms containing x to the left, all other terms to the right
6x=15
x=15/6
x=2+1/2
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