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a in (-oo:+oo)
-4*a-(5/9) = 119/45 // - 119/45
-4*a-(5/9)-(119/45) = 0
-4*a-5/9-119/45 = 0
-4*a-16/5 = 0 // + 16/5
-4*a = 16/5 // : -4
a = 16/5/(-4)
a = -4/5
a = -4/5
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