-10r=-90

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Solution for -10r=-90 equation: 



-10r=-90

We move all terms to the left:

-10r-(-90)=0

We add all the numbers together, and all the variables

-10r+90=0

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

-10r=-90

r=-90/-10

r=+9

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