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k in (-oo:+oo)
(2/5)*k+1/3 = -37/15 // + -37/15
(2/5)*k+1/3-(-37/15) = 0
(2/5)*k+1/3+37/15 = 0
2/5*k+14/5 = 0 // - 14/5
2/5*k = -14/5 // : 2/5
k = -14/5/2/5
k = -7
k = -7
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