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a in (-oo:+oo)
(1/2)*(25-(5*a)) = 4-a // - 4-a
(1/2)*(25-(5*a))+a-4 = 0
(1/2)*(25-5*a)+a-4 = 0
1/2*(25-5*a)+a-4 = 0
1/2*(25-5*a)+a-4 = 0
25/2-3/2*a-4 = 0
17/2-3/2*a = 0
17/2-3/2*a = 0
17/2-3/2*a = 0 // - 17/2
-3/2*a = -17/2 // : -3/2
a = -17/2/(-3/2)
a = 17/3
a = 17/3
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