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k in (-oo:+oo)
(1/5)*k-10 = -248/25 // + -248/25
(1/5)*k-(-248/25)-10 = 0
(1/5)*k+248/25-10 = 0
1/5*k-2/25 = 0 // + 2/25
1/5*k = 2/25 // : 1/5
k = 2/25/1/5
k = 2/5
k = 2/5
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