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