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x in (-oo:+oo)
2*(2*y-1)+((y^4)/9)*(y+3) = g // - g
2*(2*y-1)+((y^4)/9)*(y+3)-g = 0
2*(2*y-1)+1/9*y^4*(y+3)-g = 0
2*(2*y-1)+1/9*y^4*(y+3)-g = 0
1/9*y^5-g+1/3*y^4+4*y-2 = 0
1/9*y^5-g+1/3*y^4+4*y-2 = 0
x belongs to the empty set
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