SOLUTION: The opposite of a number is tripled then decreased by 7. The result is 3 greater than twice the number. What is the number?

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Question 286943: The opposite of a number is tripled then decreased by 7. The result is 3 greater than twice the number. What is the number?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
3(-n)-7 means: The opposite of a number is tripled then decreased by 7.
=2n+3 means: The result is 3 greater than twice the number. What is the number?
3%28-n%29-7=2n%2B3solve for n, use PEMDAS.
%28-3n%29-7=2n%2B3add 3n
-7=5n%2B3subtract 3
-10=5n
highlight%28-2=n%29
____________
check
3%28-n%29-7=2n%2B3
3%28-%28-2%29%29-7=2%28-2%29%2B3
3%282%29-7=%28-4%29%2B3
6-7=-1
-1=-1
correct