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5(1+3b)=65
We move all terms to the left:
5(1+3b)-(65)=0
We add all the numbers together, and all the variables
5(3b+1)-65=0
We multiply parentheses
15b+5-65=0
We add all the numbers together, and all the variables
15b-60=0
We move all terms containing b to the left, all other terms to the right
15b=60
b=60/15
b=4
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