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a in (-oo:+oo)
(-1/8)*a = 3/4 // - 3/4
(-1/8)*a-(3/4) = 0
(-1/8)*a-3/4 = 0
-1/8*a-3/4 = 0 // + 3/4
-1/8*a = 3/4 // : -1/8
a = 3/4/(-1/8)
a = -6
a = -6
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