Step 1: 

The Algebraic expression is .

Distribute terms using distributive property: a( b + c) = ab + ac.

Subtract 5x from each side.

Cancel common terms.

Subtract 6 from each side.

Cancel common terms.

Divide each side by 7.

.

Solution :

.

(2)

The Algebraic expression is .

Distribute terms using distributive property: a( b + c) = ab + ac.

Add 15 to each side.

Cancel common terms.

Divide each side by 3.

.

Solution :