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k in (-oo:+oo)
25 = (1/5)*k // - (1/5)*k
25-((1/5)*k) = 0
(-1/5)*k+25 = 0
25-1/5*k = 0 // - 25
-1/5*k = -25 // : -1/5
k = -25/(-1/5)
k = 125
k = 125
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