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### 5 Answers

- 1 decade agoFavorite Answer
You remind me of my old school days, Are you really serious you don't know the answer?

But anyway this is the way you do it...

277=178-u

every time you swap a number to the other side of the '=' (equal) sighn, the number changes to be the opposite value of what it was....

Like this

277-178=-u

178 has now become -178

now 277-178 is 99

therefore 99=-u

the questions asks you to solve for U not -U

Now we have to swap sides so -u becomes U and 99 becomes -99.

Here is the Full mathematical solution

277 = 178 - U

277 - 178 = - U

99 =- U

0 = - U-99 (optional step)

therefore U = - 99

- SAMUEL DLv 71 decade ago
277 = 178 - u

Transpose u

277 + u = 178 - u + u

277 + u = 178

Transpose 277

277 + u - 277 = 178 - 277

u = - 99

- - - - - - -s-

- Joel LLv 61 decade ago
Subtract 178 from both sides

277 - 178 = -u

99 = -u

Multiply both sides by -1

-99 = u <<=== answer

- 1 decade ago
its just one step above regular addition or subtraction,dont let the letters confuse yo, just like saying 277-178,the the -u is like -1. = -99

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