book Maths Puzzle Numerical Ability

simplify:

6 over 2x-12 minus 20 over x^2-4x-12

Please explain in detail so I understand Thanks.

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book Other Question

hi
i dont understand how to write these equations in standard form using integers.
the problems are:
1.y=-x/3+2/3
2.y=4x-11
3.y=-4/5x=/65
PLEASE HELP ME ASAP
THANKS!! (7-4i)^2