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s in (-oo:+oo)
(-2/3)*s = -1/7 // + -1/7
(-2/3)*s-(-1/7) = 0
(-2/3)*s+1/7 = 0
1/7-2/3*s = 0 // - 1/7
-2/3*s = -1/7 // : -2/3
s = -1/7/(-2/3)
s = 3/14
s = 3/14
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