Example

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

Question

$$20a2-15ab-8am+6bm$$

Evaluate

$6bm-8am-15ab+20a_{2}$

Differentiate w.r.t. a_2

$20$

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