The chance that he will catch a grey squirrel is
82/147
but you are trying to figure out the chance of him NOT getting a grey squirrel so
147/147 - 82 /147 = 65/147
65/147 is your answer and you can not round that down anymore
What are the other expressions then I can help
A proportion is a statement that two ratios are equal
ANSWER
The substitution property of equality.
EXPLANATION
We know that:

and that

Since x=5 or 5=x , we can substitute x for 5 wherever we see x in the given equation.
When we do that, we obtain;

This is what we refer to as the substitution property of equality.