The problem in the image asks to solve for $g(-3)$ given the following:

1. $f(x) = 2x - 1$
2. $(f \circ g)(x) = -14x + 21$, which means $f(g(x)) = -14x + 21$.

Steps:

1. From $f(g(x)) = -14x + 21$, we know that applying the function $f(x) = 2x - 1$ to $g(x)$ must give the expression on the right side. $f(g(x)) = 2g(x) - 1 = -14x + 21$

2. Solve for ( g(x) \