55+9r-1=180

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



55+9r-1=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

9r-126=0

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

9r=126

r=126/9

r=14

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