Answer:
3x
Explanation:
All terms have the same variable, x, so all terms are like terms.
To combine like terms, combine the coefficients.
Remember that x is the same as 1x.
x - 2x + 3x - 4x + 5x =
= 1x - 2x + 3x - 4x + 5x
= (1 - 2 + 3 - 4 + 5)x
= 3x