r-10=10-9r

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



r-10=10-9r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

r+9r-10-10=0

We add all the numbers together, and all the variables

10r-20=0

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

10r=20

r=20/10

r=2

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