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k in (-oo:+oo)
3*k-(5/8) = 2*k-(37/72) // - 2*k-(37/72)
3*k-(2*k)-(5/8)+37/72 = 0
3*k-2*k-5/8+37/72 = 0
k-1/9 = 0 // + 1/9
k = 1/9
k = 1/9
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