Equation VS Expression

3x + 7 = 4t - 3
and
7x(7+1) - 3t(5-12x)

Okay, so what is different about the above and why does it matter?

Answer: One you can solve, and one you can manipulate (such as simplify).

A really good way (and the way I use) to remember is that equations have an equals (=) sign.

3x=5 -> “3 x equals 5″.

With an equation, we seek a solution set (if it exists). Expressions, however, are something you can manipulate.

Equations we solve, expressions we manipulate.

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