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k in (-oo:+oo)
3*k-3/4 = 7/4 // - 7/4
3*k-3/4-(7/4) = 0
3*k-3/4-7/4 = 0
3*k-5/2 = 0 // + 5/2
3*k = 5/2 // : 3
k = 5/2/3
k = 5/6
k = 5/6
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