Mashaal Masha
The equation $\frac{x^{2}+6x-7}{x+7}=ax+d$ is true for all $x\neq-7$, where $a$ and $d$ are integers. What is the value of $a+d$?
Difficulty: Hard
A: 

$-6$

B: 

$-1$

C: 

$0$

D: 

$1$

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