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X+78+90+4X+24+X+90=360
We move all terms to the left:
X+78+90+4X+24+X+90-(360)=0
We add all the numbers together, and all the variables
6X-78=0
We move all terms containing X to the left, all other terms to the right
6X=78
X=78/6
X=13
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