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S in (-oo:+oo)
(3/10)*S = S-140 // - S-140
(3/10)*S-S+140 = 0
140-7/10*S = 0 // - 140
-7/10*S = -140 // : -7/10
S = -140/(-7/10)
S = 200
S = 200
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