а) \( 2 - 6x - 6 = 5 - 4x \)
\( -4 - 6x = 5 - 4x \)
\( -4 - 5 = 6x - 4x \)
\( -9 = 2x \)
\( x = -4.5 \)
б) Умножим обе части на 4:
\( 2(5x + 4) + 12 = 9x \)
\( 10x + 8 + 12 = 9x \)
\( 10x + 20 = 9x \)
\( 10x - 9x = -20 \)
\( x = -20 \)
в) \( 4x + 10 = 5 - x \)
\( 4x + x = 5 - 10 \)
\( 5x = -5 \)
\( x = -1 \)
г) \( -72 + 81x = 4x + 5 \)
\( 81x - 4x = 5 + 72 \)
\( 77x = 77 \)
\( x = 1 \)
д) Умножим обе части на 4:
\( 52 + x = 4x + 4 \)
\( 52 - 4 = 4x - x \)
\( 48 = 3x \)
\( x = 16 \)
Ответ: а) \( x = -4.5 \); б) \( x = -20 \); в) \( x = -1 \); г) \( x = 1 \); д) \( x = 16 \)