Question 1010629

The following is known about three numbers: If the second number is subtracted from the sum of the first number and 3 times the third number, the result is 2. The third number plus 3 times the first number is -1. The first number plus 3 times the second number plus the third number is -16. Find the sum of the three numbers.
<pre>First number:    0
Second number: - 5
Third number:  - 1
Sum of numbers: 0 - 5 - 1, or {{{highlight_green(- 6)}}}