Answer: 18x
Explanation: The three parts of this expression, +5x, +3x, and +10x are called terms and the numbers in front of the variables, +5, +3, and +10 are called coefficients.
Because the variables, x, x, and x are identical,
the three terms in this problem are called like terms.
Like terms can be added together
by simply adding their coefficients.
So in this problem, since 5 + 3 + 10 is 18, 5x + 3x + 10 is simply 18x.
