SOLUTION: the difference between a number and fifteen is seven. find the number.

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Question 867: the difference between a number and fifteen is seven. find the number.
Found 2 solutions by usyim88hk, Meemo:
Answer by usyim88hk(158) About Me  (Show Source):
You can put this solution on YOUR website!
1) Let the number be x
2) x-15 = 7 or 15-x = 7 (Let's slove the first equation first)
3) x-15+15 = 7+15 (add both sides by fifteen)
4) x = 22 (Check: 22-15=7 , 7=7 [it is right])
5) 15-x+x = 7+x (Add x to both sides)
6) 15 = 7+x
7) 15-7 = 7+x-7 (subtract 7 from both sides)
8) x = 8 (Check: 15 = 7+8 , 15=15 [it is right])
9) x = 22 or 8 (FINISH!)

Answer by Meemo(8) About Me  (Show Source):
You can put this solution on YOUR website!
x+15=7
x=7-15
x= -8
x=the number