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a in (-oo:+oo)
(1/4)*a-(4/9) = 7/9-(5/6) // - 7/9-(5/6)
(1/4)*a-(4/9)-(7/9)+5/6 = 0
(1/4)*a-4/9-7/9+5/6 = 0
1/4*a-7/18 = 0 // + 7/18
1/4*a = 7/18 // : 1/4
a = 7/18/1/4
a = 14/9
a = 14/9
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