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a in (-oo:+oo)
(3/4)*a-2 = a // - a
(3/4)*a-a-2 = 0
-1/4*a-2 = 0 // + 2
-1/4*a = 2 // : -1/4
a = 2/(-1/4)
a = -8
a = -8
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