r-20/(-1)=0

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Solution for r-20/(-1)=0 equation: 



r-20/(-1)=0

We multiply all the terms by the denominator


r*(-1)-20=0

We multiply parentheses

-1r-20=0

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

-r=20

r=20/-1

r=-20

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