The expression is
.
Distribute terms using distributive property:
.

Apply multiplicative identity property:
.

(Divide:
)
\
Distribute terms using distributive property:
.

Apply multiplicative identity property:
.

(Divide:
)
Apply commutative property of addition:
.

Combine like terms using distributive property:
.

(Add: 5 + 12 = 17)
Combine like terms using distributive property:
.

(Subtract:
)
The simplified expression is
.