exam Maths Puzzle Numerical Ability

CAN A FRACTION, A DECIMAL POINT, OR A NEGATIVE NUMBER HAVE A ABSOLUTE VALUE ?

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9/11-3/11+7/11=??

Help again please, I never understood the fraction stuff and still dont. I always forget which goes with what. Can someone help me please? Hi. Thanks in advance for your help. The problem is:

S = p / (q+p)(1-q) ; solve for "q"

I know the answer for this problem is: q = p(1-s) / s(1-p)
But I can't seem to get th