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