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s in (-oo:+oo)
(8*s+14)/4 = -1/2 // + -1/2
(8*s+14)/4-(-1/2) = 0
(8*s+14)/4+1/2 = 0
(2*(8*s+14))/(2*4)+(1*4)/(2*4) = 0
2*(8*s+14)+1*4 = 0
16*s+32 = 0
(16*s+32)/(2*4) = 0
(16*s+32)/(2*4) = 0 // * 2*4
16*s+32 = 0
16*s+32 = 0 // - 32
16*s = -32 // : 16
s = -32/16
s = -2
s = -2
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