Question

The product of some negative number and 7 less than three times that number is 20. find the number.

Answer 1

The given relation is
n·(3n-7) = 20

In standard form, this is
3n² -7n -20 = 0
(n -4)(3n +5) = 0
n = 4 or -5/3

The number is -5/3.