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x in (-oo:+oo)
X^2-(x*((12-(4*y))/4)) = 0
X^2-(x*((12-4*y)/4)) = 0
(-1*x*(12-4*y))/4+X^2 = 0
(-1*x*(12-4*y))/4+(4*X^2)/4 = 0
4*X^2-1*x*(12-4*y) = 0
4*X^2-12*x+4*x*y = 0
4*X^2-12*x+4*x*y = 0
4*(X^2-3*x+x*y) = 0
X^2-3*x = 0 // - X^2
-3*x = -X^2 // : -3
x = (-X^2)/(-3)
x = (X^2)/3
4*(x-1/3*X^2) = 0
(4*(x-1/3*X^2))/4 = 0
(4*(x-1/3*X^2))/4 = 0 // * 4
4*(x-1/3*X^2) = 0
( 4 )
4 = 0
x belongs to the empty set
( x-1/3*X^2 )
x-1/3*X^2 = 0 // + -1/3*X^2
x = -(-1/3*X^2)
x = 1/3*X^2
x = 1/3*X^2
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