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a in (-oo:+oo)
a/3 = 6/18 // - 6/18
a/3-(6/18) = 0
a/3-1/3 = 0
1/3*a-1/3 = 0 // + 1/3
1/3*a = 1/3 // : 1/3
a = 1/3/1/3
a = 1
a = 1
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