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OpenStudy (anonymous):
add /simplify if possible 7/9z^3 + 1/21z^2
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jhonyy9 (jhonyy9):
7/9z3 + 1/21z2 =z2(7/9z +1/21)=z2(7*7/63z +1*3/63)=z2(49z +3)/63
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