3/7=r/4

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Solution for 3/7=r/4 equation: 


r in (-oo:+oo)

3/7 = r/4 // - r/4

3/7-(r/4) = 0

3/7-1/4*r = 0 // - 3/7

-1/4*r = -3/7 // : -1/4

r = -3/7/(-1/4)

r = 12/7

r = 12/7

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