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k in (-oo:+oo)
1-4*k = 5*k+100 // - 5*k+100
1-4*k-(5*k)-100 = 0
1-4*k-5*k-100 = 0
-9*k-99 = 0 // + 99
-9*k = 99 // : -9
k = 99/(-9)
k = -11
k = -11
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