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3(3b-1)+5(4b+3)=7
We move all terms to the left:
3(3b-1)+5(4b+3)-(7)=0
We multiply parentheses
9b+20b-3+15-7=0
We add all the numbers together, and all the variables
29b+5=0
We move all terms containing b to the left, all other terms to the right
29b=-5
b=-5/29
b=-5/29
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