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