Question 1075082
Mary is x years old...
 The present age of Mary's niece if her niece is 3 years less than one third Mary's age 5 years ago.
:
let n = niece's present age
:
n = {{{1/3}}}(x-5) - 3
3n = (x-5) - 9
3n = x - 14
n = {{{((x-14))/3}}}