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