Rozwiązanie:
a) x * 7 - 11 = 10 | +11
x * 7 = 21 | :7
x = 3
L = 3 * 7 - 11 = 10
P = 10
L = P
b) 1/2x + 6 = 13 | -6
1/2x = 7 | *2
x = 14
L = 1/2 * 14 + 6 = 13
P = 13
c) 5 * x + 21 = 46 | -21
5 * x = 25 | :5
x = 5
L = 5 * 5 + 21 = 46
P = 46
