-54=7r+2r

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Solution for -54=7r+2r equation: 



-54=7r+2r

We move all terms to the left:

-54-(7r+2r)=0

We add all the numbers together, and all the variables

-(+9r)-54=0

We get rid of parentheses

-9r-54=0

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

-9r=54

r=54/-9

r=-6

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