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