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k in (-oo:+oo)
10-(5*k) = 55 // - 55
10-(5*k)-55 = 0
10-5*k-55 = 0
-5*k-45 = 0 // + 45
-5*k = 45 // : -5
k = 45/(-5)
k = -9
k = -9
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