exam Maths Puzzle Numerical Ability

-7x+3=-15/2

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exam Other Question

I know the answer just do not understand how the answer were derived for finding lowest term of 62550912 /(over) 172514736. Can you explain how the answer of 44936 / 123933 was de Solve.

(m squared-5mn+3n squared)(m squared+4mn-2n squared)