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k in (-oo:+oo)
10 = (-4/5)*k-10 // - (-4/5)*k-10
10-((-4/5)*k)+10 = 0
(4/5)*k+10+10 = 0
4/5*k+20 = 0 // - 20
4/5*k = -20 // : 4/5
k = -20/4/5
k = -25
k = -25
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