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a in (-oo:+oo)
121/18 = 2*a-((3/4)*a)-(7/9) // - 2*a-((3/4)*a)-(7/9)
(3/4)*a-(2*a)+121/18+7/9 = 0
(3/4)*a-2*a+121/18+7/9 = 0
15/2-5/4*a = 0 // - 15/2
-5/4*a = -15/2 // : -5/4
a = -15/2/(-5/4)
a = 6
a = 6
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