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x in (-oo:+oo)
((3*x)/5)*x = -2/3-1 // + -2/3-1
((3*x)/5)*x-(-2/3)+1 = 0
((3*x)/5)*x+2/3+1 = 0
3/5*x^2 = -5/3 // : 3/5
x^2 = -25/9
x belongs to the empty set
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