-9=10-r

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Solution for -9=10-r equation: 



-9=10-r

We move all terms to the left:

-9-(10-r)=0

We add all the numbers together, and all the variables

-(-1r+10)-9=0

We get rid of parentheses

1r-10-9=0

We add all the numbers together, and all the variables

r-19=0

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

r=19

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