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OpenStudy (anonymous):
multiply and simplify z^2-81 * z+4 ------ ---- 3z+12 z-9
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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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