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a in (-oo:+oo)
12/8 = a/6 // - a/6
12/8-(a/6) = 0
3/2-1/6*a = 0 // - 3/2
-1/6*a = -3/2 // : -1/6
a = -3/2/(-1/6)
a = 9
a = 9
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