book Maths Puzzle Numerical Ability

I need help please with the following equations:

-8 is less than/equal to 4d - 26

15 + 2(5z - 50) <68

5 - 40X <125

9n - 54 > -36

Thank you so much!!

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book Other Question
multiply:

5x+5/x-2*2x^2-8x+8/x^2-1 How many games have to be played to determine a champion from 64 teams in a tripple elimination tournament?