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k in (-oo:+oo)
-(5*k)-k-10 = -82 // + 82
82-(5*k)-k-10 = 0
82-5*k-k-10 = 0
72-6*k = 0 // - 72
-6*k = -72 // : -6
k = -72/(-6)
k = 12
k = 12
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