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s in (-oo:+oo)
s/(-10) = -7/10 // + -7/10
s/(-10)-(-7/10) = 0
s/(-10)+7/10 = 0
7/10-1/10*s = 0 // - 7/10
-1/10*s = -7/10 // : -1/10
s = -7/10/(-1/10)
s = 7
s = 7
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