exam Maths Puzzle Numerical Ability

If;- x/7= y+4z/(2z-(x+r/2)) +(9t/6t) what is the value of x if p/r is 4.76785?

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exam Other Question

Given the matrix A=

1 1 1
1 2 3
1 4 5

Find a 3X3 matrix, B, that is not the identity matrix or the zero matrix such that AB = BA

Thank you The equation of Circle P is X squared + Y squared - 6x + 4y= 21, and the equation of circle Q is X squared + y squared - 8x + 10y = 11. How do I find the difference between the centers of these circles?