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5x-12.5=x+7.5
We move all terms to the left:
5x-12.5-(x+7.5)=0
We get rid of parentheses
5x-x-7.5-12.5=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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