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k in (-oo:+oo)
4-5*k = 2*k+53 // - 2*k+53
4-5*k-(2*k)-53 = 0
4-5*k-2*k-53 = 0
-7*k-49 = 0 // + 49
-7*k = 49 // : -7
k = 49/(-7)
k = -7
k = -7
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