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k in (-oo:+oo)
(-2/5)*k+3 = 10 // - 10
(-2/5)*k-10+3 = 0
-2/5*k-7 = 0 // + 7
-2/5*k = 7 // : -2/5
k = 7/(-2/5)
k = -35/2
k = -35/2
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