CPM Homework Help : MC1 Problem 3-118

Find the value of each expression below. Change any subtraction problem to an equivalent addition problem and draw it with $+$ and $−$ pieces.

$-5+(-7)$
Hint (b):
The drawing should look something like this:
$-----$
$-------$

$-5-(-7)$
Hint (d):
For the expression $-5-(-7)$ , draw three pairs of zeros ( $+$ & $-$ ). Then add $5$ negatives. Then take out $7$ negatives. Remove any zeros. What is left?