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K in (-oo:+oo)
51 = (3/4)*K // - (3/4)*K
51-((3/4)*K) = 0
(-3/4)*K+51 = 0
51-3/4*K = 0 // - 51
-3/4*K = -51 // : -3/4
K = -51/(-3/4)
K = 68
K = 68
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