1) 5x² - 11x +2 = 0 - Поменяли знак
x=
x1 = 2; x2 = 0.2
2) x - 5(x+4) = 2(x-8)+8
x - 5x - 20 = 2x - 18 +8
-6x = 10
x =
3) (5a-2b) - (3b - 4a) = 5a - 2b - 3b + 4a = 9a - 5b
4) (6с-b) - (2c+3b) = 6c - b - 2c - 3b = 4c - 4b = 4 (c - b)
5) 2x - (3x + y) = 6y
2x - 3x - y - 6y = 0
-x - 7y = 0
-x = 7y