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a in (-oo:+oo)
5/27 = (5*a)/18 // - (5*a)/18
5/27-((5*a)/18) = 0
(-5/18)*a+5/27 = 0
5/27-5/18*a = 0 // - 5/27
-5/18*a = -5/27 // : -5/18
a = -5/27/(-5/18)
a = 2/3
a = 2/3
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