Решаем уравнение:
\[ 4(14 + 4x) - 3x = 6x \]
\[ 56 + 16x - 3x = 6x \]
\[ 56 + 13x = 6x \]
\[ 13x - 6x = -56 \]
\[ 7x = -56 \]
\[ x = -\frac{56}{7} \]
\[ x = -8 \]
Ответ: -8