What's 20+13x-5+5x+9

Question

I don't know how to combin like terms with varibles and usin distributive property 

Answer 1

Rule: combine the similar terms: Xs with Xs, Ys with Ys and simple terms with simple terms then combine their results in a simple expression.

13x    and  5x    therefore 13x +  5x= +18x

 

20 + -5 + 9 = 

15 + 9 = 24

 

24+ 18x   Final answer

Answer 2

You can use the commutative property of addition to re-write this as:

 

20 - 5 + 9 + 13x + 5x

 

Now you should clearly be able to combine like terms. Obviously, the constant terms can be added to one another, and the two variable terms can be added together by adding their coefficients (which are 13 and 5)