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a in (-oo:+oo)
a/9-(1/4) = 23/36 // - 23/36
a/9-(1/4)-(23/36) = 0
a/9-1/4-23/36 = 0
1/9*a-8/9 = 0 // + 8/9
1/9*a = 8/9 // : 1/9
a = 8/9/1/9
a = 8
a = 8
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