Answer:
Part 1)

The value of x is

Part 2)

Explanation:
Part 1) Simplify the given equation
we have

In the left side, remove the parenthesis and apply the distributive property
Remember that

so


Combine like terms left side

Adds 7x both sides

subtract 15 both sides

Divide by 7 both sides

Part 2) Solve for x.

Apply distributive property both sides

Group terms that contain the same variable

Combine like terms
