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s in (-oo:+oo)
5*s-(7/4) = 7 // - 7
5*s-(7/4)-7 = 0
5*s-7/4-7 = 0
5*s-35/4 = 0 // + 35/4
5*s = 35/4 // : 5
s = 35/4/5
s = 7/4
s = 7/4
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