exam Maths Puzzle Numerical Ability

identify the Properties of Equality that justify the indicated steps.

AB+CD =XY
CD+DE =XY
XY =CD+DE
AB+CD =CD+ DE

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exam Other Question

(x/x+1) - (2/x-1) - 1

please explain/show this to me... i tried doing it and again, only got very partial credit . i dont understand the whole LCD thing with the negatives... __2x-1__ <_ -9 or __2x_-1__ >_ 5
4 4

These are fractions with the 4 as the bottom number, I tried to make the lines look a bit better like they are ac