exam Maths Puzzle Numerical Ability

Can you please help me or explain to me how to solve : a positive and navative square root of 0.75 and come out with the exact value.

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How do I solve?

The reciprocal of 4 plus the reciprocal of 5 is the reciprocal of what number?
-4y - (5y +6) = -7y + 3 i need a step by step on how to solve
-4y (-5y +6) = -7y + 3
20y + 6 = -7y + 3
i got stuck here