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