81=r/5

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Solution for 81=r/5 equation: 


r in (-oo:+oo)

81 = r/5 // - r/5

81-(r/5) = 0

81-1/5*r = 0 // - 81

-1/5*r = -81 // : -1/5

r = -81/(-1/5)

r = 405

r = 405

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