Simplify.

Right.

To simplify the expression 3w - 10w, you can combine the like terms. Like terms have the same variable raised to the same exponent.

In this case, both terms have the variable "w" raised to the first power.

To combine the terms, you subtract the coefficients of the like terms.

So, 3w - 10w becomes (-7w).

Therefore, the simplified expression is -7w.