If f(x) = x − 7, find the following.

f(13)
f(-6)
f(p)

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In equation :

f(x) = x − 7

replace x with given numbers.

f ( 13 ) = 13 - 7 = 6

f ( - 6 ) = - 6 - 7 = - 13

f ( p ) = p - 7