If f(x) = x - 9, then find f(x) - f(-x)
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f (x)=x-9
f (-x)= -x-9
f (x)- f (-x ) = x-9 -(-x-9)
= x-9 +x+9
=2x
f (-x)= -x-9
f (x)- f (-x ) = x-9 -(-x-9)
= x-9 +x+9
=2x
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