Mashaal Masha
The function $f$ is defined by $f(x)=7x-84$. What is the $x$-intercept of the graph of $y=f(x)$ in the $xy$-plane?
Difficulty: Medium
A: 

$(-12,0)$

B: 

$(-7,0)$

C: 

$(7,0)$

D: 

$(12,0)$

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