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K in (-oo:+oo)
5*K-(3*(K-2)) = -6/4 // + -6/4
5*K-(3*(K-2))-(-6/4) = 0
5*K-3*(K-2)+3/2 = 0
(-3*2*(K-2))/2+(2*5*K)/2+3/2 = 0
2*5*K-3*2*(K-2)+3 = 0
4*K+3+12 = 0
4*K+15 = 0
(4*K+15)/2 = 0
(4*K+15)/2 = 0 // * 2
4*K+15 = 0
4*K+15 = 0 // - 15
4*K = -15 // : 4
K = -15/4
K = -15/4
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