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