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k in (-oo:+oo)
(2/3)*k = 28*(4/9) // - 28*(4/9)
(2/3)*k-(28*(4/9)) = 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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