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s in (-oo:+oo)
(4/5)*s-((3/4)*s) = 7/10 // - 7/10
(4/5)*s-((3/4)*s)-(7/10) = 0
(4/5)*s+(-3/4)*s-7/10 = 0
1/20*s-7/10 = 0 // + 7/10
1/20*s = 7/10 // : 1/20
s = 7/10/1/20
s = 14
s = 14
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