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a in (-oo:+oo)
-54 = 4*a+a-9 // - 4*a+a-9
9-(4*a)-a-54 = 0
9-4*a-a-54 = 0
-5*a-45 = 0 // + 45
-5*a = 45 // : -5
a = 45/(-5)
a = -9
a = -9
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