9=r+21/8

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Solution for 9=r+21/8 equation: 



9=r+21/8

We move all terms to the left:

9-(r+21/8)=0

We add all the numbers together, and all the variables

-(+r+21/8)+9=0

We get rid of parentheses

-r+9-21/8=0

We multiply all the terms by the denominator


-r*8-21+9*8=0

We add all the numbers together, and all the variables

-r*8+51=0

Wy multiply elements

-8r+51=0

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

-8r=-51

r=-51/-8

r=6+3/8

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