3/9=r/7

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Solution for 3/9=r/7 equation: 


r in (-oo:+oo)

3/9 = r/7 // - r/7

3/9-(r/7) = 0

1/3-1/7*r = 0 // - 1/3

-1/7*r = -1/3 // : -1/7

r = -1/3/(-1/7)

r = 7/3

r = 7/3

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