Answer
See below.
Work Step by Step
We apply the logic that
subtracting $b$ from $a$, we
$\mathrm{a}\mathrm{d}\mathrm{d}$ the opposite, or additive inverse, of $b$ to $a.$
$a-b=a+(-b)$
So,
change the operation, subtraction to addition,
change the sign of the number being subtracted,
and then add,
using rules for adding numbers (with the same sign or different signs).
