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a in (-oo:+oo)
a-(5/2) = (3*a)/4+a-(25/6) // - (3*a)/4+a-(25/6)
a-((3*a)/4)-a-(5/2)+25/6 = 0
a+(-3/4)*a-a-5/2+25/6 = 0
5/3-3/4*a = 0 // - 5/3
-3/4*a = -5/3 // : -3/4
a = -5/3/(-3/4)
a = 20/9
a = 20/9
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