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2x-120+0.5x+15+x-30=180
We move all terms to the left:
2x-120+0.5x+15+x-30-(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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