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a in (-oo:+oo)
3*a-(a/2)+12 = 27 // - 27
3*a-(a/2)-27+12 = 0
5/2*a-15 = 0 // + 15
5/2*a = 15 // : 5/2
a = 15/5/2
a = 6
a = 6
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