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a in (-oo:+oo)
a/6 = 21/54 // - 21/54
a/6-(21/54) = 0
a/6-7/18 = 0
1/6*a-7/18 = 0 // + 7/18
1/6*a = 7/18 // : 1/6
a = 7/18/1/6
a = 7/3
a = 7/3
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