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k in (-oo:+oo)
50 = k/4.5 // - k/4.5
50-(k/4.5) = 0
50-0.22222222*k = 0
50-0.22222222*k = 0 // - 50
-0.22222222*k = -50 // : -0.22222222
k = -50/(-0.22222222)
k = 225.00000225
k = 225.00000225
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