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x in (-oo:+oo)
4*x^2 = ((5*x)/3)*x-1 // - ((5*x)/3)*x-1
4*x^2-(((5*x)/3)*x)+1 = 0
4*x^2+(-5/3)*x^2+1 = 0
7/3*x^2 = -1 // : 7/3
x^2 = -3/7
x belongs to the empty set
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