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a in (-oo:+oo)
a/5 = 9/3 // - 9/3
a/5-(9/3) = 0
a/5-3 = 0
1/5*a-3 = 0 // + 3
1/5*a = 3 // : 1/5
a = 3/1/5
a = 15
a = 15
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