exam Maths Puzzle Numerical Ability

Simplify

7a/a-b
______
4b/a + b

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exam Other Question

. Find the midpoint between these points:
(-2, 7) and(-8,-5) I need to solve the problem using an augmented matrix. The problem is:
2x-3y+z=5
x+3y+8z=22
3x-y+2z=12

I put it in augmented matrix notation myself:
2 -3 1 5
1 3 8 22