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a in (-oo:+oo)
(1/2)*a+(1/3)*a-(1/8)-(1/4) = 0
(1/2)*a+(1/3)*a-1/8-1/4 = 0
5/6*a-3/8 = 0 // + 3/8
5/6*a = 3/8 // : 5/6
a = 3/8/5/6
a = 9/20
a = 9/20
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