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k in (-oo:+oo)
4/5 = k+2/45 // - k+2/45
4/5-k-(2/45) = 0
4/5-k-2/45 = 0
34/45-k = 0 // - 34/45
-k = -34/45 // * -1
k = 34/45
k = 34/45
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