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