10r=-90+r

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Solution for 10r=-90+r equation: 



10r=-90+r

We move all terms to the left:

10r-(-90+r)=0

We add all the numbers together, and all the variables

10r-(r-90)=0

We get rid of parentheses

10r-r+90=0

We add all the numbers together, and all the variables

9r+90=0

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

9r=-90

r=-90/9

r=-10

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