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k in (-oo:+oo)
(-1/4)*k = -3/5 // + -3/5
(-1/4)*k-(-3/5) = 0
(-1/4)*k+3/5 = 0
3/5-1/4*k = 0 // - 3/5
-1/4*k = -3/5 // : -1/4
k = -3/5/(-1/4)
k = 12/5
k = 12/5
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