161=-10+9r

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Solution for 161=-10+9r equation: 



161=-10+9r

We move all terms to the left:

161-(-10+9r)=0

We add all the numbers together, and all the variables

-(9r-10)+161=0

We get rid of parentheses

-9r+10+161=0

We add all the numbers together, and all the variables

-9r+171=0

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

-9r=-171

r=-171/-9

r=+19

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