32/42=r/21

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Solution for 32/42=r/21 equation: 


r in (-oo:+oo)

32/42 = r/21 // - r/21

32/42-(r/21) = 0

16/21-1/21*r = 0 // - 16/21

-1/21*r = -16/21 // : -1/21

r = -16/21/(-1/21)

r = 16

r = 16

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