The expression to simplify is

We will simplify by combining like terms.
• There are FIVE x's and TWENTY-SIX more x's. We add.
5x + 26x = 31 x
• There is 1 constant, NEGATIVE THIRTEEN. No combining required so leave it as is.
,
•
,
• There is 1 term with y, which is SEVEN y. No combining required, so we leave it as is.
The final expression is
