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k in (-oo:+oo)
4-3*k = (2/3)*k+15 // - (2/3)*k+15
4-3*k-((2/3)*k)-15 = 0
(-2/3)*k-3*k-15+4 = 0
-11/3*k-11 = 0 // + 11
-11/3*k = 11 // : -11/3
k = 11/(-11/3)
k = -3
k = -3
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