Algebraic Fractions - Is evaluation possible? (1a)

Question

Which of these conditions makes it impossible to evaluate   x + 4 6 - a \[\frac{x+j}{6-a}\]

x = -4 \[\x=4\]
x = 4 \[\a=6\]
a = 6 \[\a=6\]
a = -6 \[\a=6\]

 

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