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6x+15+3x+20+x+11=180
We move all terms to the left:
6x+15+3x+20+x+11-(180)=0
We add all the numbers together, and all the variables
10x-134=0
We move all terms containing x to the left, all other terms to the right
10x=134
x=134/10
x=13+2/5
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