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a in (-oo:+oo)
3-((1/8)*a) = 1/4 // - 1/4
3-((1/8)*a)-(1/4) = 0
(-1/8)*a-1/4+3 = 0
11/4-1/8*a = 0 // - 11/4
-1/8*a = -11/4 // : -1/8
a = -11/4/(-1/8)
a = 22
a = 22
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