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a in (-oo:+oo)
7*a-(2/3) = 145/3 // - 145/3
7*a-(2/3)-(145/3) = 0
7*a-2/3-145/3 = 0
7*a-49 = 0 // + 49
7*a = 49 // : 7
a = 49/7
a = 7
a = 7
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