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k in (-oo:+oo)
(2/5)*k = 7/12 // - 7/12
(2/5)*k-(7/12) = 0
(2/5)*k-7/12 = 0
2/5*k-7/12 = 0 // + 7/12
2/5*k = 7/12 // : 2/5
k = 7/12/2/5
k = 35/24
k = 35/24
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