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k in (-oo:+oo)
7 = (12/5)*k-5 // - (12/5)*k-5
5-((12/5)*k)+7 = 0
(-12/5)*k+5+7 = 0
12-12/5*k = 0 // - 12
-12/5*k = -12 // : -12/5
k = -12/(-12/5)
k = 5
k = 5
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