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k in (-oo:+oo)
(3/5)*k-(7/10) = 1/2 // - 1/2
(3/5)*k-(7/10)-(1/2) = 0
(3/5)*k-7/10-1/2 = 0
3/5*k-6/5 = 0 // + 6/5
3/5*k = 6/5 // : 3/5
k = 6/5/3/5
k = 2
k = 2
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