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X-30+2X-120+.5X+15=180
We move all terms to the left:
X-30+2X-120+.5X+15-(180)=0
We add all the numbers together, and all the variables
3.5X-315=0
We move all terms containing X to the left, all other terms to the right
3.5X=315
X=315/3.5
X=90
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