\[7(3x + 6) - (20x + 4) = 0\]
\[21x + 42 - 20x - 4 = 0\]
\[x + 38 = 0\]
\[x = -38\]
\[-6(4x - 3) + (7 - 6x) = 0\]
\[-24x + 18 + 7 - 6x = 0\]
\[-30x + 25 = 0\]
\[-30x = -25\]
\[x = \frac{-25}{-30} = \frac{5}{6}\]
\[-5(3y + 3) + 2(7y - 6) = 0\]
\[-15y - 15 + 14y - 12 = 0\]
\[-y - 27 = 0\]
\[-y = 27\]
\[y = -27\]
\[6(5 - 4x) + 5(5x + 5) = 9\]
\[30 - 24x + 25x + 25 = 9\]
\[x + 55 = 9\]
\[x = 9 - 55\]
\[x = -46\]
Ответ: а) x = 38; б) x = 13/30; в) y = -27/1; г) x = -56/1
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