Example

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

Question

$$(2r+3x78+7)$$

Evaluate

$3x_{78}+2r+7$

Differentiate w.r.t. r

$2$

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