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a in (-oo:+oo)
a/(-2) = 2.5-(3*a) // - 2.5-(3*a)
a/(-2)+3*a-2.5 = 0
5/2*a-2.5 = 0 // + 2.5
5/2*a = 2.5 // : 5/2
a = 2.5/5/2
a = 1
a = 1
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