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a in (-oo:+oo)
-a-1 = 4*a-(56/11) // - 4*a-(56/11)
56/11-a-(4*a)-1 = 0
56/11-a-4*a-1 = 0
45/11-5*a = 0 // - 45/11
-5*a = -45/11 // : -5
a = -45/11/(-5)
a = 9/11
a = 9/11
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