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2x-120)+(x-30)=(1/2+15)=180
We move all terms to the left:
2x-120)+(x-30)-((1/2+15))=0
We add all the numbers together, and all the variables
2x-120)+(x-15=0
We move all terms containing x to the left, all other terms to the right
2x-120)+(x=15
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