SOLUTION: if twice a number is added to the number the result is -15. find the number. write and solve equation

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Question 818041: if twice a number is added to the number the result is -15. find the number. write and solve equation
Found 2 solutions by jim_thompson5910, FightinBlueHens:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
if twice a number is added to the number the result is -15

translates to

2x + x = -15

Solve for x to get

2x + x = -15

3x = -15

x = -15/3

x = -5

Answer by FightinBlueHens(27) About Me  (Show Source):
You can put this solution on YOUR website!
What number plus itself, plus itself gives you -15?
Remember: Adding by a negative number is subtracting it, so if I take 2 grapes away from you, I am adding -2 grapes to the grapes that you have,
What number, 3 times itself gives you -15?
If negative 15 is the total, what number goes into it 3 times?

3x=-15

x=-5