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D( x )
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
(4*x+7)/(3*x-2) = y^2 // - y^2
(4*x+7)/(3*x-2)-y^2 = 0
(4*x+7)/(3*x-2)+(-y^2*(3*x-2))/(3*x-2) = 0
4*x-y^2*(3*x-2)+7 = 0
4*x-3*x*y^2+2*y^2+7 = 0
(4*x-3*x*y^2+2*y^2+7)/(3*x-2) = 0
(4*x-3*x*y^2+2*y^2+7)/(3*x-2) = 0 // * 3*x-2
4*x-3*x*y^2+2*y^2+7 = 0
2*y^2-3*x*y^2+7 = 0 // - 2*y^2+7
-3*x*y^2 = -(2*y^2+7) // : -3*y^2
x = (-(2*y^2+7))/(-3*y^2)
x = (1/3)*y^-2*(2*y^2+7)
x = (1/3)*y^-2*(2*y^2+7)
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