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x in (-oo:+oo)
(1/2)*(6-(8*y)) = x // - x
(1/2)*(6-(8*y))-x = 0
(1/2)*(6-8*y)-x = 0
1/2*(6-8*y)-x = 0
1/2*(6-8*y)-x = 0
3-x-4*y = 0
3-x-4*y = 0
3-x-4*y = 0 // - 3-4*y
-x = -(3-4*y) // * -1
x = 3-4*y
x = 3-4*y
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