Evaluate the following for the given values:
a
−
b
\displaystyle {a}-{b}
a
−
b
, for
a
=
−
9
\displaystyle {a}=-{9}
a
=
−
9
and
b
=
1
\displaystyle {b}={1}
b
=
1
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Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity