9r-1+55+90=180

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



9r-1+55+90=180

We move all terms to the left:

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