SOLUTION: Help me with this equation. Thank you. three tiemes the sum of a number and -78 is 36. Find the number. A) -14 B) -66 C) 90 D) 38

Algebra ->  Equations -> SOLUTION: Help me with this equation. Thank you. three tiemes the sum of a number and -78 is 36. Find the number. A) -14 B) -66 C) 90 D) 38      Log On


   

Question 679899: Help me with this equation. Thank you.
three tiemes the sum of a number and -78 is 36. Find the number.
A) -14
B) -66
C) 90
D) 38
Found 2 solutions by ReadingBoosters, Miller828:
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
3(n+-78) = 36
3(n-78) = 36
...
Divide both sides by 3
n-78 = 12
Isolate the n variable
n = 12 + 78
n = 90
...
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Answer by Miller828(3) About Me  (Show Source):
You can put this solution on YOUR website!
36 = 3x + (-78)
3x = 36 + 78 [adding 78 to both sides]
3x = 114
X = 114 / 3
X = 38