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k in (-oo:+oo)
5-(4*k) = 5*k+50 // - 5*k+50
5-(4*k)-(5*k)-50 = 0
5-4*k-5*k-50 = 0
-9*k-45 = 0 // + 45
-9*k = 45 // : -9
k = 45/(-9)
k = -5
k = -5
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