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s in (-oo:+oo)
(3*s)/4+7 = 2/5 // - 2/5
(3*s)/4-(2/5)+7 = 0
(3*s)/4-2/5+7 = 0
3/4*s+33/5 = 0 // - 33/5
3/4*s = -33/5 // : 3/4
s = -33/5/3/4
s = -44/5
s = -44/5
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