exam Maths Puzzle Numerical Ability

2(8x+2)=3(2x-7)

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exam Other Question

This is not from a textbook. I do not understand the AND / OR in the following equations:

4x-6_>2 AND 5x-4>21 _> is less than or equal to

2-4x<6 OR 3-x>9 solve each formula for the W variable if P=2L+2W