18-b=21-2b

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Solution for 18-b=21-2b equation: 



18-b=21-2b

We move all terms to the left:

18-b-(21-2b)=0

We add all the numbers together, and all the variables

-b-(-2b+21)+18=0

We add all the numbers together, and all the variables

-1b-(-2b+21)+18=0

We get rid of parentheses

-1b+2b-21+18=0

We add all the numbers together, and all the variables

b-3=0

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

b=3

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