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5x+12x+7x+4+104=360
We move all terms to the left:
5x+12x+7x+4+104-(360)=0
We add all the numbers together, and all the variables
24x-252=0
We move all terms containing x to the left, all other terms to the right
24x=252
x=252/24
x=10+1/2
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