9=-7/4(21)+b

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Solution for 9=-7/4(21)+b equation: 



9=-7/4(21)+b

We move all terms to the left:

9-(-7/4(21)+b)=0



Domain of the equation: 421+b)!=0

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

b)!=-421

b!=-421/1

b!=-421

b∈R



We add all the numbers together, and all the variables

-(+b-7/421)+9=0

We get rid of parentheses

-b+9+7/421=0

We multiply all the terms by the denominator


-b*421+7+9*421=0

We add all the numbers together, and all the variables

-b*421+3796=0

Wy multiply elements

-421b+3796=0

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

-421b=-3796

b=-3796/-421

b=9+7/421

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