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a in (-oo:+oo)
6 = (-1/8)*a // - (-1/8)*a
6-((-1/8)*a) = 0
(1/8)*a+6 = 0
1/8*a+6 = 0 // - 6
1/8*a = -6 // : 1/8
a = -6/1/8
a = -48
a = -48
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