[tex]2x + 7 + 2x + 7 + 3x + 8y + 3x + [/tex] your going to simply the expression by grouping first next adding like terms [tex]2x + 2x + 3x + 3x + 8y + 8y + 7 + 7 \\ 10x + 16y + 14[/tex] N.B DO NOT PUT A EQUAL SIGN IN A EXPRESSION OR YOUR GOING TO BE WRITING AN EQUATION.