Answer:
The product of -6 and a number x, decreased by 18 is -390.
According to the above problem, we get
[tex] - 6x - 18 = - 390 \\ - 6x = - 390 + 18 \\ - 6x = - 372 \\ x = \frac{ (- 372)}{( - 6)} \\ \boxed{x = 62 }[/tex]
Therefore, the numbers is 62.
