SOLUTION: If 3 times the number is subtracted from 15. The result will be equal to the number decreased by 21?

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Question 301434: If 3 times the number is subtracted from 15. The result will be equal to the number decreased by 21?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
15-3x=x-21
-3x-x=-21-15
-4x=-36
x=-36/-4
x=9 ans.
Proof:
15-3*9=9-21
15-27=-12
-12=-12