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a in (-oo:+oo)
(3/4)*a = 1/2 // - 1/2
(3/4)*a-(1/2) = 0
(3/4)*a-1/2 = 0
3/4*a-1/2 = 0 // + 1/2
3/4*a = 1/2 // : 3/4
a = 1/2/3/4
a = 2/3
a = 2/3
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