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k in (-oo:+oo)
(3/8)*k+21/2 = 73/4 // - 73/4
(3/8)*k+21/2-(73/4) = 0
(3/8)*k+21/2-73/4 = 0
3/8*k-31/4 = 0 // + 31/4
3/8*k = 31/4 // : 3/8
k = 31/4/3/8
k = 62/3
k = 62/3
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