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x/2.5+12=15
We move all terms to the left:
x/2.5+12-(15)=0
We add all the numbers together, and all the variables
x/2.5-3=0
We multiply all the terms by the denominator
x-3*2.5=0
We add all the numbers together, and all the variables
x-7.5=0
We move all terms containing x to the left, all other terms to the right
x=7.5
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