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S in (-oo:+oo)
3-((1/10)*S) = 6-(1/5) // - 6-(1/5)
1/5-((1/10)*S)-6+3 = 0
(-1/10)*S+1/5-6+3 = 0
-1/10*S-14/5 = 0 // + 14/5
-1/10*S = 14/5 // : -1/10
S = 14/5/(-1/10)
S = -28
S = -28
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