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a in (-oo:+oo)
1-a = 5*a-11 // - 5*a-11
1-a-(5*a)+11 = 0
1-a-5*a+11 = 0
12-6*a = 0 // - 12
-6*a = -12 // : -6
a = -12/(-6)
a = 2
a = 2
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