4=r/5

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Solution for 4=r/5 equation: 


r in (-oo:+oo)

4 = r/5 // - r/5

4-(r/5) = 0

4-1/5*r = 0 // - 4

-1/5*r = -4 // : -1/5

r = -4/(-1/5)

r = 20

r = 20

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