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