55=7r-8

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Solution for 55=7r-8 equation: 



55=7r-8

We move all terms to the left:

55-(7r-8)=0

We get rid of parentheses

-7r+8+55=0

We add all the numbers together, and all the variables

-7r+63=0

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

-7r=-63

r=-63/-7

r=+9

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