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