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s in (-oo:+oo)
40-((8*s)/5) = 2*s+8 // - 2*s+8
40-((8*s)/5)-(2*s)-8 = 0
(-8/5)*s-2*s-8+40 = 0
32-18/5*s = 0 // - 32
-18/5*s = -32 // : -18/5
s = -32/(-18/5)
s = 80/9
s = 80/9
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