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

please help me solve the following square root of 2/3 * squareroot 8/12 HI i am trying to find out what the slopes are for these two inequalities 3x<-6 , 3m-18>-6