5(b-1)=15

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Solution for 5(b-1)=15 equation: 



5(b-1)=15

We move all terms to the left:

5(b-1)-(15)=0

We multiply parentheses

5b-5-15=0

We add all the numbers together, and all the variables

5b-20=0

We move all terms containing b to the left, all other terms to the right

5b=20

b=20/5

b=4

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