book Maths Puzzle Numerical Ability

Hi My problem is this:

2[3/(19-4^2)] solve.
you have to show each step.
also when you show each step you have to show
the property and i dont understand properties that mu

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book Other Question

If the cost of a new car is $25,000 (plus 8% sales tax) and a down payment of 15% (including the tax) is required, how much money will a consumer need to drive out in a new car? 1/2x+2/x-1=3 I need your help in solving this equation