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u/[u-(u+1/2)]=4
u/(u-u-1/2)=4
u/-1/2=4
-2u=4
u=-2

answer book says the answer is 2...

If you substitute what the answer book has, then the answer will be -4 and not 4.

With the negative in front of (u+1/2), then u becomes -u and the +1/2 becomes
-1/2.

If the equation is meant to be the following:
u/(u-u+1/2)=4 then u=2 is correct.

i guess i need to figure out the equation button and re-post my question

the (u+1/2) is not written correctly. it's (u+1)over 2. make sense?

my apologies for mistyping the equation initially