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

this year, 75% of the graduating class of Harriet Tubman High School had taken at least 8 math courses. Of the remaing class members, 60% had taken 6 or 7 math courses.What percent of the graduating class had taken fewer than 6 math courses????? One crew can put up holiday decorations in the mall in 9 hours. A second crew can put up the decorations in 7 hours. How long will it take if both crews work together to decorate the mall? Please enter your answer as a number without the units.