Simplifying Rational Expressions4x-12/4x

These are the answers i wanted corrected:
4x12/4x
d+7/d^2-49
t^2-25/t^2+t-20
2x^2+6x+4/4x^2-12x-16
6-y/y^2-2y-24


You will have to use brackets to show the intended order of operation.

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