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a in (-oo:+oo)
(1/5)*(25-(5*a)) = 4-9 // - 4-9
(1/5)*(25-(5*a))-4+9 = 0
(1/5)*(25-5*a)-4+9 = 0
1/5*(25-5*a)-4+9 = 0
1/5*(25-5*a)-4+9 = 0
1-a+9 = 0
10-a = 0
10-a = 0
10-a = 0 // - 10
-a = -10 // * -1
a = 10
a = 10
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