20/30=k/9

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Solution for 20/30=k/9 equation: 


k in (-oo:+oo)

20/30 = k/9 // - k/9

20/30-(k/9) = 0

2/3-1/9*k = 0 // - 2/3

-1/9*k = -2/3 // : -1/9

k = -2/3/(-1/9)

k = 6

k = 6

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