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a in (-oo:+oo)
a/30 = 3/10 // - 3/10
a/30-(3/10) = 0
a/30-3/10 = 0
1/30*a-3/10 = 0 // + 3/10
1/30*a = 3/10 // : 1/30
a = 3/10/1/30
a = 9
a = 9
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