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x in (-oo:+oo)
4*x-1 = (8*x-5)/2 // - (8*x-5)/2
4*x-((8*x-5)/2)-1 = 0
(-1*(8*x-5))/2+4*x-1 = 0
(-1*(8*x-5))/2+(2*4*x)/2+(-1*2)/2 = 0
2*4*x-1*(8*x-5)-1*2 = 0
5-2 = 0
3 = 0
3/2 = 0
3/2 = 0 // * 2
3 = 0
x belongs to the empty set
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