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3(b-1)=10
We move all terms to the left:
3(b-1)-(10)=0
We multiply parentheses
3b-3-10=0
We add all the numbers together, and all the variables
3b-13=0
We move all terms containing b to the left, all other terms to the right
3b=13
b=13/3
b=4+1/3
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