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x+x+18+4x-9+4x-9=360
We move all terms to the left:
x+x+18+4x-9+4x-9-(360)=0
We add all the numbers together, and all the variables
10x-360=0
We move all terms containing x to the left, all other terms to the right
10x=360
x=360/10
x=36
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