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a in (-oo:+oo)
(3/2)*a = 5/4 // - 5/4
(3/2)*a-(5/4) = 0
(3/2)*a-5/4 = 0
3/2*a-5/4 = 0 // + 5/4
3/2*a = 5/4 // : 3/2
a = 5/4/3/2
a = 5/6
a = 5/6
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