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a in (-oo:+oo)
5/9 = (5/2)*a-(10/9) // - (5/2)*a-(10/9)
5/9-((5/2)*a)+10/9 = 0
(-5/2)*a+5/9+10/9 = 0
5/3-5/2*a = 0 // - 5/3
-5/2*a = -5/3 // : -5/2
a = -5/3/(-5/2)
a = 2/3
a = 2/3
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