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3(b-25)+b=225
We move all terms to the left:
3(b-25)+b-(225)=0
We add all the numbers together, and all the variables
b+3(b-25)-225=0
We multiply parentheses
b+3b-75-225=0
We add all the numbers together, and all the variables
4b-300=0
We move all terms containing b to the left, all other terms to the right
4b=300
b=300/4
b=75
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