step 1. 2/3(6e + 9f - 21g) - 7f Factor the expression
step 2. 2/3 3(2e + 3f - 7g) - 7f Reduce the numbers
step 3. 2(2e + 3f - 7g) - 7f Multiply through parenthesis by 2
step 4. 4e + 6f - 14g - 7f Collect the like terms
step 5. 4e - f - 14g
answer= 4e - f - 14g
Hope this helps :)