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