Suppose that \(f: \mathbb{R} \rightarrow \mathbb{R}\) is a continuous function…

Suppose that $f: \mathbb{R} \rightarrow \mathbb{R}$ is a continuous function on the interval [−3,3] and a differentiable function in the interval (−3,3) such that for every $x$ in the interval, $f’(x) \leq 2$ if $f(-3)=7$, then $f(3)$ is at most __________ .