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k in (-oo:+oo)
1.2 = 0.8-k/5 // - 0.8-k/5
1.2-(-k/5)-0.8 = 0
(1/5)*k-0.8+1.2 = 0
1/5*k+0.4 = 0 // - 0.4
1/5*k = -0.4 // : 1/5
k = -0.4/1/5
k = -2
k = -2
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