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k in (-oo:+oo)
5*k-(2/9) = 41/18 // - 41/18
5*k-(2/9)-(41/18) = 0
5*k-2/9-41/18 = 0
5*k-5/2 = 0 // + 5/2
5*k = 5/2 // : 5
k = 5/2/5
k = 1/2
k = 1/2
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