55+90+(9r-1)=90

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Solution for 55+90+(9r-1)=90 equation: 



55+90+(9r-1)=90

We move all terms to the left:

55+90+(9r-1)-(90)=0

We add all the numbers together, and all the variables

(9r-1)+55=0

We get rid of parentheses

9r-1+55=0

We add all the numbers together, and all the variables

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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