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x in (-oo:+oo)
(1/4)*(2/5-(4*x))-(2/5) = 4/5 // - 4/5
(1/4)*(2/5-(4*x))-(2/5)-(4/5) = 0
(1/4)*(2/5-4*x)-2/5-4/5 = 0
1/4*(2/5-4*x)-2/5-4/5 = 0
(1/4*5*(2/5-4*x))/5-2/5-4/5 = 0
1/4*5*(2/5-4*x)-4-2 = 0
-5*x-4-3/2 = 0
-5*x-11/2 = 0
(-5*x-11/2)/5 = 0
(-5*x-11/2)/5 = 0 // * 5
-5*x-11/2 = 0
-5*x-11/2 = 0 // + 11/2
-5*x = 11/2 // : -5
x = 11/2/(-5)
x = -11/10
x = -11/10
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