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