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x in (-oo:+oo)
1/1 = (4/5)*x-(1/4) // - (4/5)*x-(1/4)
1/1-((4/5)*x)+1/4 = 0
(-4/5)*x+1/4+1 = 0
5/4-4/5*x = 0 // - 5/4
-4/5*x = -5/4 // : -4/5
x = -5/4/(-4/5)
x = 25/16
x = 25/16
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