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a in (-oo:+oo)
5*a+9 = 27-4*a // - 27-4*a
5*a-(-4*a)-27+9 = 0
5*a+4*a-27+9 = 0
9*a-18 = 0 // + 18
9*a = 18 // : 9
a = 18/9
a = 2
a = 2
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