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k in (-oo:+oo)
(10/5)*k-7 = (15/5)*k-3 // - (15/5)*k-3
(10/5)*k-((15/5)*k)-7+3 = 0
(10/5)*k-3*k-7+3 = 0
-k-4 = 0 // + 4
-k = 4 // * -1
k = -4
k = -4
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