-4x-21=-7x-3
3x-18 = 0
3x = 18
x = 6
7(3х – 4) – 5 = 9
раскроем скобки
21x-28-5 = 9
21x-42 = 0
21x = 42
x = 2
-4x-21=-7x-3
3x-18 = 0
3x = 18
x = 6
7(3х – 4) – 5 = 9
раскроем скобки
21x-28-5 = 9
21x-42 = 0
21x = 42
x = 2