exam Maths Puzzle Numerical Ability

please solve this it would be greatly appreciated:

solve:n
-4 +n=12-4n/n-4

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exam Other Question

4 over the square root of 2x I have a rectangular block of dimensions 12 by 5 by 7 cm
from this is derived a triangle CAG
the distance from A to C is 17 cm
and the distance from A to G is 24 cm.
the hypot