Divide z (4z²-81) by 4 z (2z-9)
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z((2z)^2-(9)^2) /4z(2z-9)
z(2z-9)(2z+9) / 4z(2z-9)
Cancel like terms z(2z-9)
=>(2z+9) / 4
z(2z-9)(2z+9) / 4z(2z-9)
Cancel like terms z(2z-9)
=>(2z+9) / 4
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