5/7=r/20

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Solution for 5/7=r/20 equation: 


r in (-oo:+oo)

5/7 = r/20 // - r/20

5/7-(r/20) = 0

5/7-1/20*r = 0 // - 5/7

-1/20*r = -5/7 // : -1/20

r = -5/7/(-1/20)

r = 100/7

r = 100/7

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