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a in (-oo:+oo)
6 = 2*a-(5*a)+9 // - 2*a-(5*a)+9
5*a-(2*a)-9+6 = 0
5*a-2*a-9+6 = 0
3*a-3 = 0 // + 3
3*a = 3 // : 3
a = 3/3
a = 1
a = 1
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