can you find all the number for which the rational expression is undefined in 5/7v+4

can you find all the number for which the rational expression is undefined for 5/7v+4
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For it to be undefined, the denominator of the rational expression must be zero.
The denominator is 7v + 4, so we have:

7v + 4 = 0
7v = -4
v = -4 / 7

Hence, the rational expression is undefined when v = -4/7.
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x-3/x^2+16x+63
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