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