# algebra

-21+3z/2 divide 121z-847/4

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1. You need to use parentheses. Otherwise the sequence of operations is not clear, and many different interpretations and results are possible.

Do you mean
[(-21+z)/2]/(121z-847)/4] ?

That would be 2(z-21)/(121z-847)
= (2/121)(z-21)/(z-7)

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