Change the words "a number" by N
Twice N divided by 4 is 16
Cange the words "N divided by 4" to
Twice is 16
Change the word "Twice" to "2 times"
2 times is 16
Replace the word "times" with "*"
2* is 16
Replace "2*" by is 16
Replace the word "is" by " = "
Multiply both sides by 4:
Divide both sides by 2
Edwin