five times an unknown number decreased by the same unknown number is less than the opposite of the sum of the unknown number and five

n - an unknown number

five times an unknown number decreased by the same unknown number is less than the opposite of the sum of the unknown number and five

5n - n < - (n + 5)

4n < - n - 5 add n to both sides

5n < - 5 divide both sides by 5

n < - 1