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K in (-oo:+oo)
(5/3)*(3*K+4)+4*K-(2/3) = 0
(5/3)*(3*K+4)+4*K-2/3 = 0
5/3*(3*K+4)+4*K-2/3 = 0
(5/3*3*(3*K+4))/3+(3*4*K)/3-2/3 = 0
5/3*3*(3*K+4)+3*4*K-2 = 0
27*K-2+20 = 0
27*K+18 = 0
(27*K+18)/3 = 0
(27*K+18)/3 = 0 // * 3
27*K+18 = 0
27*K+18 = 0 // - 18
27*K = -18 // : 27
K = -18/27
K = -2/3
K = -2/3
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