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k in (-oo:+oo)
36/5-(2*k) = (2/5)*k-(3/2) // - (2/5)*k-(3/2)
36/5-(2*k)-((2/5)*k)+3/2 = 0
(-2/5)*k-2*k+36/5+3/2 = 0
87/10-12/5*k = 0 // - 87/10
-12/5*k = -87/10 // : -12/5
k = -87/10/(-12/5)
k = 29/8
k = 29/8
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