21=4b-5b+18

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Solution for 21=4b-5b+18 equation: 



21=4b-5b+18

We move all terms to the left:

21-(4b-5b+18)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1b-18+21=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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