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x in (-oo:+oo)
(1/4)*x = (2/5)*x-1 // - (2/5)*x-1
(1/4)*x-((2/5)*x)+1 = 0
(1/4)*x+(-2/5)*x+1 = 0
1-3/20*x = 0 // - 1
-3/20*x = -1 // : -3/20
x = -1/(-3/20)
x = 20/3
x = 20/3
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