-10+r=-9r

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Solution for -10+r=-9r equation: 



-10+r=-9r

We move all terms to the left:

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

We get rid of parentheses

r+9r-10=0

We add all the numbers together, and all the variables

10r-10=0

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

10r=10

r=10/10

r=1

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