30=b/4+21

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Solution for 30=b/4+21 equation: 



30=b/4+21

We move all terms to the left:

30-(b/4+21)=0

We get rid of parentheses

-b/4-21+30=0

We multiply all the terms by the denominator


-b-21*4+30*4=0

We add all the numbers together, and all the variables

-1b+36=0

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

-b=-36

b=-36/-1

b=+36

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