SOLUTION: Seven times the difference of 7 and a number gives 70. Find the number. A.)-3 B.)3 C.)21 D.)-21 I think the number is 21 but i'm not sure. I've tried writing it ou as

Algebra ->  Equations -> SOLUTION: Seven times the difference of 7 and a number gives 70. Find the number. A.)-3 B.)3 C.)21 D.)-21 I think the number is 21 but i'm not sure. I've tried writing it ou as       Log On


   

Question 158170: Seven times the difference of 7 and a number gives 70. Find the number.
A.)-3 B.)3 C.)21 D.)-21
I think the number is 21 but i'm not sure. I've tried writing it ou as
7(7)+x=70
What i'm having trouble with is what does the differenc eof seven mean?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
"Seven times the difference of 7 and a number gives 70" translates to 7%287-x%29=70


7%287-x%29=70 Start with the translated equation.


49-7x=70 Distribute.


-7x=70-49 Subtract 49 from both sides.


-7x=21 Combine like terms on the right side.


x=%2821%29%2F%28-7%29 Divide both sides by -7 to isolate x.


x=-3 Reduce.


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Answer:

So the answer is x=-3 which means that the answer choice is A) -3