Решение:
- а) \( 5x - 4 + 8x - 7 = 4 - 5 + 7x \)
\( 13x - 11 = -1 + 7x \)
\( 6x = 10 \)
\( x = \frac{10}{6} = \frac{5}{3} \) - б) \( 6x + 4 - 10x - 12 = 8 + 14 - 5x \)
\( -4x - 8 = 22 - 5x \)
\( x = 30 \) - в) \( 11 - 2x - 9 + 5x + 6x + 7 = 8 \)
\( 9x + 9 = 8 \)
\( 9x = -1 \)
\( x = -\frac{1}{9} \) - г) \( 4 - 3x + 5 - 4x + 6 - 6x = 13 + 8x \)
\( 15 - 13x = 13 + 8x \)
\( 2 = 21x \)
\( x = \frac{2}{21} \)
Ответ: а) \(\frac{5}{3}\); б) 30; в) -\(\frac{1}{9}\); г) \(\frac{2}{21}\).