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k in (-oo:+oo)
(2/5)*(5*k+35)-8 = 0
2/5*(5*k+35)-8 = 0
2/5*(5*k+35)-8 = 0
2*k+6 = 0
2*k+6 = 0
2*k+6 = 0 // - 6
2*k = -6 // : 2
k = -6/2
k = -3
k = -3
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