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a in (-oo:+oo)
6*a+2/3 = 6 // - 6
6*a+2/3-6 = 0
6*a-16/3 = 0 // + 16/3
6*a = 16/3 // : 6
a = 16/3/6
a = 8/9
a = 8/9
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