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