Hej!
2x + 7 = 23
2x = 23 - 7
2x = 16 / : 2
x = 8
spr :
L = 2 * 8 + 7 = 16 + 7 = 23
P = 23
L = P
4x - 5 = -25
4x = -25 + 5
4x = -20 / : 4
x = -5
spr :
L = 4 * (-5) - 5 = -20 - 5 = -25
P = -25
L = P
3x + 2 = x + 14
3x - 2x = 14 - 2
x = 6
spr :
L = 3 * 6 + 2 = 18 + 2 = 20
P = 6 + 14 = 20
L = P
Pozdrawiam! - Julka