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x+12+2x-5+3x+8=180
We move all terms to the left:
x+12+2x-5+3x+8-(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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