Answer:
-1
Step-by-step explanation:
Twice a number: 2n.
15 less than the number: n-15.
The sum of those: (2n) +(n-15) = 3n-15.
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The difference between -19 and the number: -19-n
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These values are the same, so we have ...
3n -15 = -19 -n
4n = -4 . . . . . . . . add n+15 to both sides
n = -1 . . . . . . . . . divide by -4
The number is -1.
