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k in (-oo:+oo)
(2/5)*(5*k-35)-8 = 12 // - 12
(2/5)*(5*k-35)-12-8 = 0
2/5*(5*k-35)-12-8 = 0
2/5*(5*k-35)-12-8 = 0
2*k-26-8 = 0
2*k-34 = 0
2*k-34 = 0
2*k-34 = 0 // + 34
2*k = 34 // : 2
k = 34/2
k = 17
k = 17
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