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k in (-oo:+oo)
3*k-(4/10) = 5/4 // - 5/4
3*k-(4/10)-(5/4) = 0
3*k-2/5-5/4 = 0
3*k-33/20 = 0 // + 33/20
3*k = 33/20 // : 3
k = 33/20/3
k = 11/20
k = 11/20
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