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S in (-oo:+oo)
S = (1/5)*(300-(5*10)) // - (1/5)*(300-(5*10))
S-((1/5)*(300-(5*10))) = 0
S+(-1/5)*(300-50) = 0
S-50 = 0 // + 50
S = 50
S = 50
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