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a in (-oo:+oo)
a/12-8+13 = a // - a
a/12-a-8+13 = 0
5-11/12*a = 0 // - 5
-11/12*a = -5 // : -11/12
a = -5/(-11/12)
a = 60/11
a = 60/11
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