exam Maths Puzzle Numerical Ability

Can anyone help me with this equation? I would greatly appreciate your help.
R
__ - 6 = -R



and

x + 1x = 16
___
7

College Mathematics seventh edition pa

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exam Other Question
If F(x)= x(1-x), find [F(x+h) -F(x)/h] Three less than the square of a number can be written as