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a in (-oo:+oo)
7*a = 2/3 // - 2/3
7*a-(2/3) = 0
7*a-2/3 = 0
7*a-2/3 = 0 // + 2/3
7*a = 2/3 // : 7
a = 2/3/7
a = 2/21
a = 2/21
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