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3.5x-13.5+15x=8.7
We move all terms to the left:
3.5x-13.5+15x-(8.7)=0
We add all the numbers together, and all the variables
18.5x-22.2=0
We move all terms containing x to the left, all other terms to the right
18.5x=22.2
x=22.2/18.5
x=1+1/5
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