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(12*x-(6*y))*((1/2)*x+(3/2)*y) = 0
(12*x-6*y)*((1/2)*x+(3/2)*y) = 0
(12*x-6*y)*(1/2*x+3/2*y) = 0
( 1/2*x+3/2*y )
1/2*x+3/2*y = 0 // - 3/2*y
1/2*x = -(3/2*y) // : 1/2
x = (-(3/2*y))/1/2
x = -3*y
( 12*x-6*y )
12*x-6*y = 0 // + -6*y
12*x = -(-6*y) // : 12
x = (-(-6*y))/12
x = y/2
x in { -3*y, y/2 }
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