SOLUTION: If the sum of a number and -5 is reduced by 7 the result is 15 less than three times the opposite of the number find the number

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Question 698268: If the sum of a number and -5 is reduced by 7 the result is 15 less than three times the opposite of the number find the number
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If the sum of a number and -5 is reduced by 7 the result is 15 less than three times the opposite of the number find the number
:
n = the number
-n = it's opposite
:
n + (-5) - 7 = 3(-n) - 15
n - 12 = -3n - 15
n + 3n = -15 + 12
4n = -3
n = -3/4
n = -.75
:
See if that works
-.75 - 5 - 7 = 3(.75) - 15
-12.75 = 2.25 - 15
-12.75 = -12.75