CAN SOMEONE PLEASE HELP ME WITH THIS ASAP!!!!??

-I only need 2 equations that will equal to any number that is 10-13 / 16-20 / 22-27 / 29-34 / 36-41 / and 43-47

- please create a problem that equals to any number from 1-50 except the ones I allready written...

-I need to write down 20 of them so just 2 left

- ALSO THE PROBLEM HAS TO HAVE FOUR 7’S OR ELSE IT WONT COUNT

THE PERSON WHO GIVES ME TWO CORRECT ANSWERS WILL GET 50 POINTS!!!!! P.s and a brainlist