5(1+4b)=21

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Solution for 5(1+4b)=21 equation: 



5(1+4b)=21

We move all terms to the left:

5(1+4b)-(21)=0

We add all the numbers together, and all the variables

5(4b+1)-21=0

We multiply parentheses

20b+5-21=0

We add all the numbers together, and all the variables

20b-16=0

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

20b=16

b=16/20

b=4/5

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