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k in (-oo:+oo)
(3*k)/2 = 25/4 // - 25/4
(3*k)/2-(25/4) = 0
(3*k)/2-25/4 = 0
3/2*k-25/4 = 0 // + 25/4
3/2*k = 25/4 // : 3/2
k = 25/4/3/2
k = 25/6
k = 25/6
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