book Maths Puzzle Numerical Ability

Simplify:

12x-24/8-4x

/ indicates fraction

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book Other Question

For Each function (f), find (f)-1 and the domain and range of (f) and (f)-1 . determine whether (f)-1 is a function.

23. f(x)= 3x+4

** im really not sure of where to start on
This question is actually about elimination because there werent any catorgories for elimination. My question is:
0.5x+0.5y=-2
x-0.25y=6

My answer was (2.5,-14) but I don't th