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x in (-oo:+oo)
4*x = (4/5)*(5*x-2) // - (4/5)*(5*x-2)
4*x-((4/5)*(5*x-2)) = 0
(-4/5)*(5*x-2)+4*x = 0
4*x-4/5*(5*x-2) = 0
4*x-4/5*(5*x-2) = 0
8/5 = 0
8/5 = 0
8/5 = 0 // * 5
8 = 0
8 = 0
x belongs to the empty set
x belongs to the empty set
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