exam Maths Puzzle Numerical Ability

Having some real difficulty with this bad boy, any help would be really appreciated.
By equating real and imaginary parts, find expressions for R6 and L in terms of R1, R2, R3, R4

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exam Other Question

Solve each of the following systems by using either addition or substitution (kind of like in Example 5 on p 715). If a unique solution does not exist, state whether the system is Simplify the rational expression:
x2 � 6x � 7
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x2 � 1