I like how no one is helping me oh well I guess I will fail

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

It says factor each expression 49x-28?

Determine which postulate or theorem can be used to prove that lmn =nmo