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a in (-oo:+oo)
9/12 = a/8 // - a/8
9/12-(a/8) = 0
3/4-1/8*a = 0 // - 3/4
-1/8*a = -3/4 // : -1/8
a = -3/4/(-1/8)
a = 6
a = 6
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