Example

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

Question

$$4n+Bn-42+B39$$

Evaluate

$Bn+4n+B_{39}-42$

Differentiate w.r.t. n

$B+4$

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