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s in (-oo:+oo)
(4/9)*s = -5/2 // + -5/2
(4/9)*s-(-5/2) = 0
(4/9)*s+5/2 = 0
4/9*s+5/2 = 0 // - 5/2
4/9*s = -5/2 // : 4/9
s = -5/2/4/9
s = -45/8
s = -45/8
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