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15x=12.5x+100
We move all terms to the left:
15x-(12.5x+100)=0
We get rid of parentheses
15x-12.5x-100=0
We add all the numbers together, and all the variables
2.5x-100=0
We move all terms containing x to the left, all other terms to the right
2.5x=100
x=100/2.5
x=40
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