Using inverses to solve equations

Which of these is NOT an expression?

What is the coefficient in the expression 7 - 2x

What operation is the inverse of addition?

What operation is inverse of division?

What step would I need to make to solve the equation x - 5 = 10

What steps would you use to solve the equation 2x - 5 = 10

What steps would you use to solve the equation $$\frac{2x\ -\ 5}{3}\ =\ 4$$  

What's the first step I should do to solve for  $$x\ +\ 7\ =\ 10$$  ?

x + 7 = 10

What's the first step I should do to solve for  $$-2x\ =\ 12$$  ?

$$-2x\ =\ 12$$  

What steps would you need to take in order to solve for  $$2x\ +\ 3\ =\ -7$$  

2x + 3 = -7

What steps would you need to take in order to solve for  $$-2x\ +\ 4\ =\ 16$$  ?

$$-2x\ +\ 4\ =\ 16$$