Example

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

Question

$$x^{2}+8x+7-6y-9y^{2}$$

Evaluate

$x^{2}+8x-9y^{2}-6y+7$

Differentiate w.r.t. x

$2\left(x+4\right)$

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