Example

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

Question

$$- 20 a 7 a$$

Evaluate

$-20aa_{7}$

Differentiate w.r.t. a_7

$-20a$

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