90=27-9r

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Solution for 90=27-9r equation: 



90=27-9r

We move all terms to the left:

90-(27-9r)=0

We add all the numbers together, and all the variables

-(-9r+27)+90=0

We get rid of parentheses

9r-27+90=0

We add all the numbers together, and all the variables

9r+63=0

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

9r=-63

r=-63/9

r=-7

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