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