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k in (-oo:+oo)
-19/25 = (8*k)/5-((7*k)/2) // - (8*k)/5-((7*k)/2)
(7*k)/2-((8*k)/5)-19/25 = 0
(-8/5)*k+(7*k)/2-19/25 = 0
19/10*k-19/25 = 0 // + 19/25
19/10*k = 19/25 // : 19/10
k = 19/25/19/10
k = 2/5
k = 2/5
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