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a in (-oo:+oo)
1/2 = 11*a // - 11*a
1/2-(11*a) = 0
1/2-11*a = 0
1/2-11*a = 0 // - 1/2
-11*a = -1/2 // : -11
a = -1/2/(-11)
a = 1/22
a = 1/22
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