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3x+x+12+2x+2x+4=360
We move all terms to the left:
3x+x+12+2x+2x+4-(360)=0
We add all the numbers together, and all the variables
8x-344=0
We move all terms containing x to the left, all other terms to the right
8x=344
x=344/8
x=43
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