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a in (-oo:+oo)
a/30 = 7/15 // - 7/15
a/30-(7/15) = 0
a/30-7/15 = 0
1/30*a-7/15 = 0 // + 7/15
1/30*a = 7/15 // : 1/30
a = 7/15/1/30
a = 14
a = 14
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