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a in (-oo:+oo)
(3*a)/2 = 2/3 // - 2/3
(3*a)/2-(2/3) = 0
(3*a)/2-2/3 = 0
3/2*a-2/3 = 0 // + 2/3
3/2*a = 2/3 // : 3/2
a = 2/3/3/2
a = 4/9
a = 4/9
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