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a in (-oo:+oo)
(4/5)*a-(4*a)+7/9 = 1619/45 // - 1619/45
(4/5)*a-(4*a)+7/9-(1619/45) = 0
(4/5)*a-4*a+7/9-1619/45 = 0
-16/5*a-176/5 = 0 // + 176/5
-16/5*a = 176/5 // : -16/5
a = 176/5/(-16/5)
a = -11
a = -11
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