x²-9≠0 => x²≠9 => x₁≠3., x₂≠-3.
x-7≠0 => x≠7.
D(y)=(-∞;-3)∪(-3;3)∪(3;7)∪(7;+∞).
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x²-9≠0 => x²≠9 => x₁≠3., x₂≠-3.
x-7≠0 => x≠7.
D(y)=(-∞;-3)∪(-3;3)∪(3;7)∪(7;+∞).