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