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K in (-oo:+oo)
(2/3)*K = (4*28)/9 // - (4*28)/9
(2/3)*K-((4*28)/9) = 0
(2/3)*K-112/9 = 0
2/3*K-112/9 = 0 // + 112/9
2/3*K = 112/9 // : 2/3
K = 112/9/2/3
K = 56/3
K = 56/3
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