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k in (-oo:+oo)
5-(5*k)-(2*k) = -72 // + 72
5-(5*k)-(2*k)+72 = 0
5-5*k-2*k+72 = 0
77-7*k = 0 // - 77
-7*k = -77 // : -7
k = -77/(-7)
k = 11
k = 11
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