f(x) = (x+8)/(x-7)
x-7≠0 => x≠7.
D(y) = (-∞; 7)∪(7;+∞).
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f(x) = (x+8)/(x-7)
x-7≠0 => x≠7.
D(y) = (-∞; 7)∪(7;+∞).