TS PSC Group 1 Services Prelims 2017 Paper

A function f : [-7,6) ⇒ R is defined as follows f(x) = \left\{ {\begin{array}{*{20}{c}} {{x^2} + 2x + 1}&{ - 7 \le x < - 5}\ {x + 5}&{ - 5 \le x \le 2}\ {x - 1}&{2 < x < 6} \end{array}} \right. what is the value of \frac{{4f( - 3) - 2f(4)}}{{f( - 6) - 4f(1)}}  ?