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a in (-oo:+oo)
5/9-((1/6)*a) = 43/18 // - 43/18
5/9-((1/6)*a)-(43/18) = 0
(-1/6)*a+5/9-43/18 = 0
-1/6*a-11/6 = 0 // + 11/6
-1/6*a = 11/6 // : -1/6
a = 11/6/(-1/6)
a = -11
a = -11
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