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k in (-oo:+oo)
5*(8-3*k) = 25 // - 25
5*(8-3*k)-25 = 0
5*(8-3*k)-25 = 0
15-15*k = 0
15-15*k = 0
15-15*k = 0 // - 15
-15*k = -15 // : -15
k = -15/(-15)
k = 1
k = 1
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