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x in (-oo:+oo)
z = x/5-(8*y) // - x/5-(8*y)
8*y-(x/5)+z = 0
8*y-1/5*x+z = 0 // - 8*y+z
-1/5*x = -(8*y+z) // : -1/5
x = (-(8*y+z))/(-1/5)
x = 5*(8*y+z)
x = 5*(8*y+z)
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