-9=r/0.8

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Solution for -9=r/0.8 equation: 


r in (-oo:+oo)

-9 = r/0.8 // - r/0.8

-(r/0.8)-9 = 0

-1.25*r-9 = 0

-1.25*r-9 = 0 // + 9

-1.25*r = 9 // : -1.25

r = 9/(-1.25)

r = -7.2

r = -7.2

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