Question

$\huge \: \boxed{question}$
21-5/7z+65/5×3z+(2-86-54)+3z

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Answer 1

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$⟴21 - \frac{5}{7z} + \frac{65}{5} \times 3z + (2 - 86 - 54) + 3z$

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$⟴21 - \frac{5}{7z} + \frac{65}{5} \times 3z + ( - 138) \times 3z$

$⟴21 - \frac{5}{7z} + 13 \times 3z + ( - 138) + 3z$

$⟴21 - \frac{5}{7z} + 39z - 138 + 3z$

$⟴ - 117 - \frac{5}{7z} + 39z + 3z$

$⟴ - 117 - \frac{5}{7z} + 42z$

$⟴ \frac{ - 819z - 5 + 249z ^{2} }{7z}$

OR

$⟴ \frac{249z ^{2} - 819z - 5 }{7z}$