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k in (-oo:+oo)
-(8*k)-56 = 1/4 // - 1/4
-(8*k)-(1/4)-56 = 0
-8*k-1/4-56 = 0
-8*k-225/4 = 0 // + 225/4
-8*k = 225/4 // : -8
k = 225/4/(-8)
k = -225/32
k = -225/32
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