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3x+(3x+15)=180
We move all terms to the left:
3x+(3x+15)-(180)=0
We get rid of parentheses
3x+3x+15-180=0
We add all the numbers together, and all the variables
6x-165=0
We move all terms containing x to the left, all other terms to the right
6x=165
x=165/6
x=27+1/2
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