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

can you help me with thequation, formula, & inequality
1) y/9=7

2) y/9+5=0

3) Given the formula K=LMN, what is the formula for M?

4) 3p-16<20. What is an example of a real world application of the quadratic formula?