4. Упрощение уравнений и поиск корня:
- a) \( 2(4x - 3) - 3(x + 5) = 14 \)
\( 8x - 6 - 3x - 15 = 14 \)
\( 5x - 21 = 14 \)
\( 5x = 35 \)
\( x = 7 \)
- б) \( 9(y - 4) - 2(3y + 5) = 5(y - 8) \)
\( 9y - 36 - 6y - 10 = 5y - 40 \)
\( 3y - 46 = 5y - 40 \)
\( -46 + 40 = 5y - 3y \)
\( -6 = 2y \)
\( y = -3 \)
- в) \( 6(a + 2) - 4(2a - 1) = 3a + 1 \)
\( 6a + 12 - 8a + 4 = 3a + 1 \)
\( -2a + 16 = 3a + 1 \)
\( 16 - 1 = 3a + 2a \)
\( 15 = 5a \)
\( a = 3 \)
- г) \( 7(2b - 5) - 3(b + 4) = 5(b - 1) + 2 \)
\( 14b - 35 - 3b - 12 = 5b - 5 + 2 \)
\( 11b - 47 = 5b - 3 \)
\( 11b - 5b = 47 - 3 \)
\( 6b = 44 \)
\( b = \frac{44}{6} = \frac{22}{3} \)
Ответ: а) x = 7; б) y = -3; в) a = 3; г) b = 22/3.