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25(10b-15)=4
We move all terms to the left:
25(10b-15)-(4)=0
We multiply parentheses
250b-375-4=0
We add all the numbers together, and all the variables
250b-379=0
We move all terms containing b to the left, all other terms to the right
250b=379
b=379/250
b=1+129/250
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