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k in (-oo:+oo)
0.12*((200*k^1)/2) = 0.04*k // - 0.04*k
0.12*((200*k^1)/2)-(0.04*k) = 0
0.12*((200*k)/2)-0.04*k = 0
11.96*k = 0 // : 11.96
k = 0
k = 0
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