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x in (-oo:+oo)
x/5-1 = 2*(x-(4/5)) // - 2*(x-(4/5))
x/5-(2*(x-(4/5)))-1 = 0
x/5-2*(x-4/5)-1 = 0
(-2*5*(x-4/5))/5+x/5+(-1*5)/5 = 0
x-2*5*(x-4/5)-1*5 = 0
8-9*x-5 = 0
3-9*x = 0
(3-9*x)/5 = 0
(3-9*x)/5 = 0 // * 5
3-9*x = 0
3-9*x = 0 // - 3
-9*x = -3 // : -9
x = -3/(-9)
x = 1/3
x = 1/3
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