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15x=12.5
We move all terms to the left:
15x-(12.5)=0
We add all the numbers together, and all the variables
15x-12.5=0
We move all terms containing x to the left, all other terms to the right
15x=12.5
x=12.5/15
x=3.5714285714286/4.2857142857143
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