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k in (-oo:+oo)
(3/5)*k-2/3 = -37/15 // + -37/15
(3/5)*k-2/3-(-37/15) = 0
(3/5)*k-2/3+37/15 = 0
3/5*k+9/5 = 0 // - 9/5
3/5*k = -9/5 // : 3/5
k = -9/5/3/5
k = -3
k = -3
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