36/21=r/28 - solution

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Solution for 36/21=r/28 equation:

r in (-oo:+oo)

36/21 = r/28 // - r/28

36/21-(r/28) = 0

12/7-1/28*r = 0 // - 12/7

-1/28*r = -12/7 // : -1/28

r = -12/7/(-1/28)

r = 48

r = 48

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