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k in (-oo:+oo)
4*(8-5*k) = 12 // - 12
4*(8-5*k)-12 = 0
4*(8-5*k)-12 = 0
20-20*k = 0
20-20*k = 0
20-20*k = 0 // - 20
-20*k = -20 // : -20
k = -20/(-20)
k = 1
k = 1
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