\[g(x) = - \frac{3}{4 + x}\]
\[g(x) = - 1,5\]
\[- \frac{3}{4 + x} = - 1,5\]
\[- 1,5 \cdot (4 + x) = - 3\]
\[- 6 - 1,5x = - 3\]
\[- 1,5x = 3\]
\[x = - 2.\]