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a in (-oo:+oo)
a/6 = 4/12 // - 4/12
a/6-(4/12) = 0
a/6-1/3 = 0
1/6*a-1/3 = 0 // + 1/3
1/6*a = 1/3 // : 1/6
a = 1/3/1/6
a = 2
a = 2
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