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15x+3.5x=43.75
We move all terms to the left:
15x+3.5x-(43.75)=0
We add all the numbers together, and all the variables
18.5x-43.75=0
We move all terms containing x to the left, all other terms to the right
18.5x=43.75
x=43.75/18.5
x=2+1/2.7407407407407
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