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a in (-oo:+oo)
(5/2)*(5-a) = 2 // - 2
(5/2)*(5-a)-2 = 0
5/2*(5-a)-2 = 0
5/2*(5-a)-2 = 0
21/2-5/2*a = 0
21/2-5/2*a = 0
21/2-5/2*a = 0 // - 21/2
-5/2*a = -21/2 // : -5/2
a = -21/2/(-5/2)
a = 21/5
a = 21/5
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