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s in (-oo:+oo)
(1/4)*(s-4) = s-7 // - s-7
(1/4)*(s-4)-s+7 = 0
1/4*(s-4)-s+7 = 0
1/4*(s-4)-s+7 = 0
7-3/4*s-1 = 0
6-3/4*s = 0
6-3/4*s = 0
6-3/4*s = 0 // - 6
-3/4*s = -6 // : -3/4
s = -6/(-3/4)
s = 8
s = 8
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