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x+0.25x=13.5
We move all terms to the left:
x+0.25x-(13.5)=0
We add all the numbers together, and all the variables
1.25x-13.5=0
We move all terms containing x to the left, all other terms to the right
1.25x=13.5
x=13.5/1.25
x=10+1/1.25
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