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a in (-oo:+oo)
-3 = (-1/8)*a // - (-1/8)*a
-((-1/8)*a)-3 = 0
(1/8)*a-3 = 0
1/8*a-3 = 0 // + 3
1/8*a = 3 // : 1/8
a = 3/1/8
a = 24
a = 24
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