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K in (-oo:+oo)
10/4 = (4*K)/9 // - (4*K)/9
10/4-((4*K)/9) = 0
(-4/9)*K+10/4 = 0
5/2-4/9*K = 0 // - 5/2
-4/9*K = -5/2 // : -4/9
K = -5/2/(-4/9)
K = 45/8
K = 45/8
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