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2x+15+7x+12+3x+9=180
We move all terms to the left:
2x+15+7x+12+3x+9-(180)=0
We add all the numbers together, and all the variables
12x-144=0
We move all terms containing x to the left, all other terms to the right
12x=144
x=144/12
x=12
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