3 less than the quotient of a number and 5

X/5-3

less than is another way to write "subtract" The "quotient of" is another way to write "divide" The fraction is also another way to say divided by. So assuming that x is the variable used in this situation 3 less than the quotient of x and 5 would make the expression x/5-3

N = - 15/8

Divide 8 from both sides to solve for n