4/7=r/5

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Solution for 4/7=r/5 equation: 


r in (-oo:+oo)

4/7 = r/5 // - r/5

4/7-(r/5) = 0

4/7-1/5*r = 0 // - 4/7

-1/5*r = -4/7 // : -1/5

r = -4/7/(-1/5)

r = 20/7

r = 20/7

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