Answer:
This is the same as before.
Step-by-step explanation:
Add all but only 4x and 7x will add and other the same
(4x+4)⁰+(7x+9)⁰+57= 180⁰
or, 4x+7x.......
or, 11x.....
you can add the others just the normal way. just wanted to show that how only 4x and 7x will add.
