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a in (-oo:+oo)
a/115 = 6/23 // - 6/23
a/115-(6/23) = 0
a/115-6/23 = 0
1/115*a-6/23 = 0 // + 6/23
1/115*a = 6/23 // : 1/115
a = 6/23/1/115
a = 30
a = 30
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