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x in (-oo:+oo)
1/4-4/5 = (-2/3)*x-((1/3)*x) // - (-2/3)*x-((1/3)*x)
(1/3)*x-((-2/3)*x)-4/5+1/4 = 0
(2/3)*x+(1/3)*x-4/5+1/4 = 0
x-11/20 = 0 // + 11/20
x = 11/20
x = 11/20
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