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Mathematics
OpenStudy (anonymous):

multiply and simplify z^2-81 * z+4 ------ ---- 3z+12 z-9

OpenStudy (anonymous):

(z+9)/3

OpenStudy (anonymous):

(z-9((z+9) z+4 --------- * ------ 3(z+4) z-9

OpenStudy (anonymous):

ans is given by eliza

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