Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$20 \pm z$$

Evaluate

$20±z$

Differentiate w.r.t. z

$\frac{\mathrm{d}}{\mathrm{d}z}(20±z)$

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