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12.5x-4+37.5x-4=5
We move all terms to the left:
12.5x-4+37.5x-4-(5)=0
We add all the numbers together, and all the variables
50x-13=0
We move all terms containing x to the left, all other terms to the right
50x=13
x=13/50
x=13/50
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