Решение:
- \( -6x = 48 \)
\( x = \frac{48}{-6} \)
\( x = -8 \) - \( -1,6x = -6,4 \)
\( x = \frac{-6,4}{-1,6} \)
\( x = 4 \) - \( -\frac{4}{9} x = -\frac{1}{7} \)
\( x = -\frac{1}{7} : (-\frac{4}{9}) \)
\( x = -\frac{1}{7} \cdot (-\frac{9}{4}) \)
\( x = \frac{9}{28} \)
Ответ: 1) -8; 3) 4; 5) 9/28.