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a in (-oo:+oo)
(1/3)*a-2/3 = 5/3 // - 5/3
(1/3)*a-2/3-(5/3) = 0
(1/3)*a-2/3-5/3 = 0
1/3*a-7/3 = 0 // + 7/3
1/3*a = 7/3 // : 1/3
a = 7/3/1/3
a = 7
a = 7
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