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a in (-oo:+oo)
9 = (-1/8)*a // - (-1/8)*a
9-((-1/8)*a) = 0
(1/8)*a+9 = 0
1/8*a+9 = 0 // - 9
1/8*a = -9 // : 1/8
a = -9/1/8
a = -72
a = -72
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