exam Maths Puzzle Numerical Ability

Does every infinite set has the same cardinality (number of elements).

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exam Other Question

Divide:

x^2-2x-35
_________= ??????

x+5 i cannot seem to be able to find the following answer for x. i nead the exact answer. the question is (lnx^9)*(lnx)-lnx^2-7=0

Please help
regards mr hopkins