-3+10w

To evaluate the expression -3 + 10w, where w is an unknown variable, we need to substitute a value for w and then perform the computation.

Step 1: Substitute a value for w.
Let's assume w = 2.

Step 2: Substitute the value of w into the expression.
Replace w with 2:
-3 + 10(2)

Step 3: Perform the multiplication operation.
10(2) = 20

Step 4: Perform the addition operation.
-3 + 20 = 17

Therefore, when w = 2, -3 + 10w equals 17.