Odpowiedź:
x * 2 = 8
x = 8 : 2
x = 4
sprawdzenie 4 * 2 = 8
10 * t = 130
t = 130 : 10
t = 13
spr 10 * 13 = 130
15 * x = 90
x = 90 : 15
x = 6
spr 15 * 6 = 90
s * 9 = 36
s = 36 : 9
s = 4
spr 4 * 9 = 36
x - 2 = 8
x = 8 + 2
x = 10
spr 10 - 2 = 8
c - 10 = 13
c = 13 + 10
c = 23
spr 23 - 10 = 13
x + 7 = 9
x = 9 - 7
x = 2
spr 2 + 7 = 9
s - 9 = 6
s = 6 + 9
s = 15
spr 15 - 9 = 6