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k in (-oo:+oo)
-(4*k)-9 = -41 // + 41
41-(4*k)-9 = 0
41-4*k-9 = 0
32-4*k = 0 // - 32
-4*k = -32 // : -4
k = -32/(-4)
k = 8
k = 8
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