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x*((-4*x-(6*y))/4) = 0
x*((-4*x-6*y)/4) = 0
(x*(-4*x-6*y))/4 = 0
( -4*x-6*y )
-4*x-6*y = 0 // + -6*y
-4*x = -(-6*y) // : -4
x = (-(-6*y))/(-4)
x = (-3*y)/2
( x )
x = 0
x in { (-3*y)/2, 0 }
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