book Maths Puzzle Numerical Ability

Trying to answer this: -X over 2 + 4=12 -x/2+4=12 Can you please explain the work on how to do this

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book Other Question

The quotient when 3 more than a number is divided by 3 less than that same number. Write each of the following geometric expressions using the given symbols log2 16 = 8.2 (exp -x), then x=


a) -7 b) -4/3 c) -1 d) -2/3 e) 1

exponent is -x in the 8.2 problem