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15-1.25x=13.75
We move all terms to the left:
15-1.25x-(13.75)=0
We add all the numbers together, and all the variables
-1.25x+1.25=0
We move all terms containing x to the left, all other terms to the right
-1.25x=-1.25
x=-1.25/-1.25
x=1
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