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