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k in (-oo:+oo)
(2/5)*k+1 = -13/5 // + -13/5
(2/5)*k-(-13/5)+1 = 0
(2/5)*k+13/5+1 = 0
2/5*k+18/5 = 0 // - 18/5
2/5*k = -18/5 // : 2/5
k = -18/5/2/5
k = -9
k = -9
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