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a in (-oo:+oo)
6*a+7 = 23/2 // - 23/2
6*a-(23/2)+7 = 0
6*a-23/2+7 = 0
6*a-9/2 = 0 // + 9/2
6*a = 9/2 // : 6
a = 9/2/6
a = 3/4
a = 3/4
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