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2x+1+x+16+2x+31=180
We move all terms to the left:
2x+1+x+16+2x+31-(180)=0
We add all the numbers together, and all the variables
5x-132=0
We move all terms containing x to the left, all other terms to the right
5x=132
x=132/5
x=26+2/5
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