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k in (-oo:+oo)
1/2-((2/5)*k) = -43/10 // + -43/10
1/2-((2/5)*k)-(-43/10) = 0
(-2/5)*k+1/2+43/10 = 0
24/5-2/5*k = 0 // - 24/5
-2/5*k = -24/5 // : -2/5
k = -24/5/(-2/5)
k = 12
k = 12
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