3(4-2b)=21

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Solution for 3(4-2b)=21 equation: 



3(4-2b)=21

We move all terms to the left:

3(4-2b)-(21)=0

We add all the numbers together, and all the variables

3(-2b+4)-21=0

We multiply parentheses

-6b+12-21=0

We add all the numbers together, and all the variables

-6b-9=0

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

-6b=9

b=9/-6

b=-1+1/2

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