1)
7(x) - 3(x+2) = -107x - 3x - 6 = -104x - 6 = -104x = -10 + 64x = -4x = -1
Ответ: x = -1
2)x + 3 = bx = b - 3
3)x - 2 = dx = d + 2
4)x - 3b = 8Подставляем x = b - 3b - 3 - 3b = 8-b - 3 = 8-b = 11b = -11
Ответ: b = -11
1)
7(x) - 3(x+2) = -10
7x - 3x - 6 = -10
4x - 6 = -10
4x = -10 + 6
4x = -4
x = -1
Ответ: x = -1
2)
x + 3 = b
x = b - 3
3)
x - 2 = d
x = d + 2
4)
x - 3b = 8
Подставляем x = b - 3
b - 3 - 3b = 8
-b - 3 = 8
-b = 11
b = -11
Ответ: b = -11