Variables and Expressions

[Verse]

Yo, check it, x is just a stand-in, a placeholder for the missing digit,

Could be five, could be fifty, till we solve it we won't fix it.

Expression's a math phrase, numbers, letters, operations linked,

No equals sign in sight, it's a value not yet distinct.

Take 3x plus 5: 3's the coefficient, multiplying x is what it's built to do,

The 5 stands alone, a constant term, x is the variable, that's the vocab too.

Combine like terms when the variable parts match up exact,