Find $\int \limits_2^{-1} f(x) dx\;$, given $\;\int \limits_{-1}^4 f(x) dx =4$ and$\;\int \limits_2^4 [3-f(x) ] dx=7$

Question

$$\begin {array} {1 1} (a)\;2 \\ (b)\;-4 \\ (c)\;-5 \\ (d)\;4 \end {array}$$