3. Решите уравнение: а)7 – 4 (3x - 1) = 5 (1-2x), б) 5x² – 2x=0.

а) 7 – 4(3x - 1) = 5(1 - 2x)
7 - 12x + 4 = 5 - 10x
11 - 12x = 5 - 10x
-12x + 10x = 5 - 11
-2x = -6
x = -6 / -2
x = 3

б) 5x² – 2x = 0
x(5x - 2) = 0
x₁ = 0
5x - 2 = 0
5x = 2
x₂ = 2/5 = 0.4

Ответ:
а) x = 3
б) x₁ = 0, x₂ = 0.4