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k in (-oo:+oo)
(4/5)*k+1/2 = -51/10 // + -51/10
(4/5)*k+1/2-(-51/10) = 0
(4/5)*k+1/2+51/10 = 0
4/5*k+28/5 = 0 // - 28/5
4/5*k = -28/5 // : 4/5
k = -28/5/4/5
k = -7
k = -7
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