-15=9r+1-77

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Solution for -15=9r+1-77 equation: 



-15=9r+1-77

We move all terms to the left:

-15-(9r+1-77)=0

We add all the numbers together, and all the variables

-(9r-76)-15=0

We get rid of parentheses

-9r+76-15=0

We add all the numbers together, and all the variables

-9r+61=0

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

-9r=-61

r=-61/-9

r=6+7/9

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