-73=8+9r

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Solution for -73=8+9r equation: 



-73=8+9r

We move all terms to the left:

-73-(8+9r)=0

We add all the numbers together, and all the variables

-(9r+8)-73=0

We get rid of parentheses

-9r-8-73=0

We add all the numbers together, and all the variables

-9r-81=0

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

-9r=81

r=81/-9

r=-9

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