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a in (-oo:+oo)
6*a+2/9 = 67/18 // - 67/18
6*a+2/9-(67/18) = 0
6*a+2/9-67/18 = 0
6*a-7/2 = 0 // + 7/2
6*a = 7/2 // : 6
a = 7/2/6
a = 7/12
a = 7/12
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