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s in (-oo:+oo)
4*s+13 = 7*s+34/4 // - 7*s+34/4
4*s-(7*s)-(34/4)+13 = 0
4*s-7*s-17/2+13 = 0
9/2-3*s = 0 // - 9/2
-3*s = -9/2 // : -3
s = -9/2/(-3)
s = 3/2
s = 3/2
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