40 = -5 ×

First, simplify 5 ×

to

/ Your problem should look like: 40 =
Second, multiply both sides by 8. / Your problem should look like: 320 = -5n
Third, divide both sides by -5. / Your problem should look like:

= n
Fourth, simplify

to

/ Your problem should look like:

= n
Fifth, simplify

to 64. / Your problem should look like: -64 = n
Sixth, switch sides. / Your problem should look like: n = -64
Answer:
n = -64