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s in (-oo:+oo)
(3*s+7)/4 = 5/2 // - 5/2
(3*s+7)/4-(5/2) = 0
(3*s+7)/4-5/2 = 0
(2*(3*s+7))/(2*4)+(-5*4)/(2*4) = 0
2*(3*s+7)-5*4 = 0
6*s-6 = 0
(6*s-6)/(2*4) = 0
(6*s-6)/(2*4) = 0 // * 2*4
6*s-6 = 0
6*s-6 = 0 // + 6
6*s = 6 // : 6
s = 6/6
s = 1
s = 1
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