SOLUTION: the sum of twice a number and -6 is nine more that the opposite of the number. find the number

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Question 483659: the sum of twice a number and -6 is nine more that the opposite of the number. find the number
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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the sum of twice a number and -6 is nine more that the opposite of the number.
find the number
:
let x = "a number"
then
-x = "the opposite of the number"
:
2x - 6 = -x + 9
2x + x = 9 + 6
3x = 15
x = 5 is the number