exam Maths Puzzle Numerical Ability

When solving a rational equation, why is it necessary to perform a check?

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exam Other Question

math and I don't get alone very good, so I was wondering if you could help me understand proof in Alebra.

Prove: -(a+b)=(a+)+(b)
(Property of the opposite of a sum)
Proof: Sin
The number -12.6 or in fraction form negative 63 over 5 is between two consecutive odd integers. What is the product of these two integers?