book Maths Puzzle Numerical Ability

Is this correct?
4|x|+|-4|=|-6|
4|x|+|-4|-|-4|=|-6|-|-4|
4|x|=|-6-4|
4|x|=|-10|
|x|=|-2.5|
x=-2.5

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book Other Question

Describe the locus of the points.

Points that are equadistant from the vertices of the polygon. Jim rode his bike to school at an average rate of 8mp. On his return trip home, he averaged 6mph. If the total trip took 7 hours, how far is it from home to school