Equation vs Expression

Two 3-syllable E words that end in "ion" ??! NOOOOO- oh wait, I forgot, there's a simple trick to remembering the two!

An EQUATION always has an EQUAL SIGN like this

2 + 2 = 4

An EXPRESSION expresses the problem without the equal symbol found in an equation

2 + x

Which problems are equations, and which are expressions?

A. 1x - 2

B. 4 - 2 = 2

C. 4 - (2)

D. -1 - (-3) = x

E. 5 + n = p

A. Expression

B. Equation

C. Expression

D. Equation

E. Equation

B, D and E are all "Equations" because of the equal sign. Remember: "equation," "equal."