a)

x – (2x – 1) – 2x = 2(3x – 4)

x – 2x + 1 – 2x = 6x – 8

–3x + 1 = 6x – 8

–3x – 6x = –8 – 1

–9x = –9    /: (–9)

x = 1

Sprawdzenie:

x – (2x – 1) – 2x = 1 – (2 · 1 – 1) – 2 · 1 = 1 – (2 – 1) – 2 = 1 – 1 – 2 = – 2

2(3x – 4) = 2 · (3 · 1 – 4) = 2 · (3 – 4) = 2 · (–1) = – 2

L = P

b)

3(