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K in (-oo:+oo)
(3/4)*K+2/3 = 71/12 // - 71/12
(3/4)*K+2/3-(71/12) = 0
(3/4)*K+2/3-71/12 = 0
3/4*K-21/4 = 0 // + 21/4
3/4*K = 21/4 // : 3/4
K = 21/4/3/4
K = 7
K = 7
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