Odpowiedź:
Zad 1
a) x - 13 = 28
x = 28 + 13
x = 41
b) 13 + x = 28
x = 28 - 13
x = 15
Zad 2
a) -8 + x = 27
x = 27 + 8
x = 35
b) 16 - x = 5
-x = 5 - 16
-x = -11
x = 11
c) x - 37 = 14
x = 14 + 37
x = 51
d) 6x = 15
x = 2,5
Zad 3
a) 11x - 6 = 7x - 4
11x - 7x = -4 + 6
4x = 2
x = 0,5
b) 4x + 3 = 9x - 12
4x - 9x = -12 - 3
-5x = -15
x = 3
Zad 4
5x - 7 - x = 9 - 2x - 4
5x - x + 2x = 9 - 4 + 7
6x = 12
x = 2