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a in (-oo:+oo)
5/9 = (4/9)*a+6 // - (4/9)*a+6
5/9-((4/9)*a)-6 = 0
(-4/9)*a+5/9-6 = 0
-4/9*a-49/9 = 0 // + 49/9
-4/9*a = 49/9 // : -4/9
a = 49/9/(-4/9)
a = -49/4
a = -49/4
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