Example

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

Question

$$= 9 a b + 3 a + 4 d$$

Evaluate

$9ab+3a+4d$

Differentiate w.r.t. a

$9b+3$

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