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k in (-oo:+oo)
4*k+3/8+9 = k/3 // - k/3
4*k-(k/3)+3/8+9 = 0
11/3*k+75/8 = 0 // - 75/8
11/3*k = -75/8 // : 11/3
k = -75/8/11/3
k = -225/88
k = -225/88
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