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a in (-oo:+oo)
1-6*a = -31/11 // + -31/11
1-6*a-(-31/11) = 0
31/11-6*a+1 = 0
42/11-6*a = 0 // - 42/11
-6*a = -42/11 // : -6
a = -42/11/(-6)
a = 7/11
a = 7/11
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