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