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s in (-oo:+oo)
25-((4/10)*s) = 30 // - 30
25-((4/10)*s)-30 = 0
(-2/5)*s-30+25 = 0
-2/5*s-5 = 0 // + 5
-2/5*s = 5 // : -2/5
s = 5/(-2/5)
s = -25/2
s = -25/2
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