a) 3(x - 3) = 6(2x + 1) 3x - 9 = 12x + 6 - 9x = 15 / : (- 9) x = - 1 2/3 spr. L = 3 · (- 1 2/3 - 3) = - 14 P = 6 · [2 · (- 1 2/3) + 1] = - 14 L = P b) 4(x - 3) - (x - 1) = 12 - 2x 4x - 12 - x + 1 = 12 - 2x 5x = 23 / : 5 x = 4 3/5 spr. L = 4 · (4 3/5 - 3) - (4 3/5 - 1) = 2 4/5 P = 12 - 2 · 4 3/5 = 2 4/5 L = P c) 2(2x + 3) = 4 - (3x - 6) 4x + 6 = 4 - 3x + 6 7x = 4 / : 7 x = 4/7 spr. L = 2 · (2 · 4/7 + 3) = 8 2/7 P = 4 - (3 · 4/7 - 6) = 8 2/7 L = P d) - 3(x - 4) = 7 - 2(3x - 7) - 3x + 12 = 7 - 6x + 14 3x = 9 / : 3 x = 3 spr. L = - 3 · (3 - 4) = 3 P = 7 - 2 · (3 · 3 - 7) = 3 L = P
