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k in (-oo:+oo)
-5*k-2 = 4*k-47 // - 4*k-47
47-5*k-(4*k)-2 = 0
47-5*k-4*k-2 = 0
45-9*k = 0 // - 45
-9*k = -45 // : -9
k = -45/(-9)
k = 5
k = 5
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