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k in (-oo:+oo)
(3/5)*k-(7/10) = 59/10 // - 59/10
(3/5)*k-(7/10)-(59/10) = 0
(3/5)*k-7/10-59/10 = 0
3/5*k-33/5 = 0 // + 33/5
3/5*k = 33/5 // : 3/5
k = 33/5/3/5
k = 11
k = 11
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