55+90+(9r-1)=180

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Solution for 55+90+(9r-1)=180 equation: 



55+90+(9r-1)=180

We move all terms to the left:

55+90+(9r-1)-(180)=0

We add all the numbers together, and all the variables

(9r-1)-35=0

We get rid of parentheses

9r-1-35=0

We add all the numbers together, and all the variables

9r-36=0

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

9r=36

r=36/9

r=4

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