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