4/8=r/9

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Solution for 4/8=r/9 equation: 


r in (-oo:+oo)

4/8 = r/9 // - r/9

4/8-(r/9) = 0

1/2-1/9*r = 0 // - 1/2

-1/9*r = -1/2 // : -1/9

r = -1/2/(-1/9)

r = 9/2

r = 9/2

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