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a in (-oo:+oo)
a/9 = 15/12 // - 15/12
a/9-(15/12) = 0
a/9-5/4 = 0
1/9*a-5/4 = 0 // + 5/4
1/9*a = 5/4 // : 1/9
a = 5/4/1/9
a = 45/4
a = 45/4
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