book Maths Puzzle Numerical Ability

Please help me to understand this expression

[7(x-5)-19]-[4(x-6+10]

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book Other Question

A piece of land measures 3 3/4 acres and is for sale at $60,000. What is the price per acre? Leon drove 270 miles to the lodge in the same time as Pat drove 330 miles to the lodge. If Pat drove 10 miles per hour faster than Leon, then how fast did each of them drive?