1. Решите уравнение: a) (2x-7)+(6x+1)=18; б) 24-2(5x+4)=6; 2) a) 20+4(2x-5)=14x+12; б) 15x-1-3(7x-1)-2; в) -8(11-2x)+40=3(5x-4); г) 2x-12(3-x)=1+3(x+2);

Решим уравнения: 1) a) $(2x-7)+(6x+1)=18$ $2x - 7 + 6x + 1 = 18$ $8x - 6 = 18$ $8x = 24$ $x = 3$ Ответ: x = 3 б) $24 - 2(5x + 4) = 6$ $24 - 10x - 8 = 6$ $16 - 10x = 6$ $-10x = -10$ $x = 1$ Ответ: x = 1 2) a) $20 + 4(2x - 5) = 14x + 12$ $20 + 8x - 20 = 14x + 12$ $8x = 14x + 12$ $-6x = 12$ $x = -2$ Ответ: x = -2 б) $15x - 1 - 3(7x - 1) = 2$ $15x - 1 - 21x + 3 = 2$ $-6x + 2 = 2$ $-6x = 0$ $x = 0$ Ответ: x = 0 в) $-8(11 - 2x) + 40 = 3(5x - 4)$ $-88 + 16x + 40 = 15x - 12$ $16x - 48 = 15x - 12$ $x = 36$ Ответ: x = 36 г) $2x - 12(3 - x) = 1 + 3(x + 2)$ $2x - 36 + 12x = 1 + 3x + 6$ $14x - 36 = 3x + 7$ $11x = 43$ $x = \frac{43}{11}$ Ответ: $x = \frac{43}{11}$