4/5=r/8

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Solution for 4/5=r/8 equation: 


r in (-oo:+oo)

4/5 = r/8 // - r/8

4/5-(r/8) = 0

4/5-1/8*r = 0 // - 4/5

-1/8*r = -4/5 // : -1/8

r = -4/5/(-1/8)

r = 32/5

r = 32/5

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