exam Maths Puzzle Numerical Ability

Divide and simplify.

2z-2/77 divided by z-1/22z

Thank you for any help you can give me.

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exam Other Question
Can someone help me solve the system:
{y=3x+9
{y=x^2-2x-5.
thanks so much! find the radius of the circle x^2+ y^2-4x-6y-5=0