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