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a in (-oo:+oo)
4/9 = 2*a+1/6 // - 2*a+1/6
4/9-(2*a)-(1/6) = 0
4/9-2*a-1/6 = 0
5/18-2*a = 0 // - 5/18
-2*a = -5/18 // : -2
a = -5/18/(-2)
a = 5/36
a = 5/36
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