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3x+6x+15+2x+20=180
We move all terms to the left:
3x+6x+15+2x+20-(180)=0
We add all the numbers together, and all the variables
11x-145=0
We move all terms containing x to the left, all other terms to the right
11x=145
x=145/11
x=13+2/11
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