7x+23+21x-11=180 how do you set up the equation right?

I'm not sure what you mean by set up the equation, however X=6

Step-by-step explanation:

first you add the 7x with 21x

so you have 28x+23-11=180

second step is subtracting 11 from 23

so now you have 28x+12=180

the third step is 28x+12-12=180-12

so you have 28x=168

and the you divid both sides by 28 and you get 6

The answer to number 1. is 7a+1 if your adding or simplifying.

And number 2 would be 9p^3 - 27p^2 + 48p