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(-1/4)*(8*x-(16*y)) = 0
(-1/4)*(8*x-16*y) = 0
-1/4*(8*x-16*y) = 0
( -1/4 )
-1/4 = 0
x belongs to the empty set
( 8*x-16*y )
8*x-16*y = 0 // + -16*y
8*x = -(-16*y) // : 8
x = (-(-16*y))/8
x = 2*y
x = 2*y
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