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k in (-oo:+oo)
5-(2*k) = 5*k+89 // - 5*k+89
5-(2*k)-(5*k)-89 = 0
5-2*k-5*k-89 = 0
-7*k-84 = 0 // + 84
-7*k = 84 // : -7
k = 84/(-7)
k = -12
k = -12
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