SOLUTION: What number must you add to 128 and subtract from 256 so that the answers to both examples are equal? Please help me

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Question 170834: What number must you add to 128 and subtract from 256 so that the answers to both examples are equal? Please help me
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
The statement "what number must you add to 128 and subtract from 256 so that the answers to both examples are equal" translates to x%2B128=256-x


x%2B128=256-x Start with the given equation.


x=256-x-128 Subtract 128 from both sides.


x%2Bx=256-128 Add x to both sides.


2x=256-128 Combine like terms on the left side.


2x=128 Combine like terms on the right side.


x=%28128%29%2F%282%29 Divide both sides by 2 to isolate x.


x=64 Reduce.


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Answer:

So the answer is x=64 which means that the number is 64.