7r+21=r+-9

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Solution for 7r+21=r+-9 equation: 



7r+21=r+-9

We move all terms to the left:

7r+21-(r+-9)=0

We add all the numbers together, and all the variables

7r-(r-9)+21=0

We get rid of parentheses

7r-r+9+21=0

We add all the numbers together, and all the variables

6r+30=0

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

6r=-30

r=-30/6

r=-5

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