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x in (-oo:+oo)
l = x/2+y/2 // - x/2+y/2
l-(x/2)-(y/2) = 0
l-1/2*x-1/2*y = 0 // - l-1/2*y
-1/2*x = -(l-1/2*y) // : -1/2
x = (-(l-1/2*y))/(-1/2)
x = 2*(l-1/2*y)
x = 2*(l-1/2*y)
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