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k in (-oo:+oo)
k+9 = (-2/3)*k+82/3 // - (-2/3)*k+82/3
k-((-2/3)*k)-(82/3)+9 = 0
k+(2/3)*k-82/3+9 = 0
5/3*k-55/3 = 0 // + 55/3
5/3*k = 55/3 // : 5/3
k = 55/3/5/3
k = 11
k = 11
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