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a in (-oo:+oo)
7*a-(2/9) = 16/9 // - 16/9
7*a-(2/9)-(16/9) = 0
7*a-2/9-16/9 = 0
7*a-2 = 0 // + 2
7*a = 2 // : 7
a = 2/7
a = 2/7
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