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a in (-oo:+oo)
a-(5/2) = (5*a)/4+a-(26/6) // - (5*a)/4+a-(26/6)
a-((5*a)/4)-a-(5/2)+26/6 = 0
a+(-5/4)*a-a-5/2+26/6 = 0
11/6-5/4*a = 0 // - 11/6
-5/4*a = -11/6 // : -5/4
a = -11/6/(-5/4)
a = 22/15
a = 22/15
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