Частина 2. Номер 524

x • 8 – 16 = 56
x • 8 = 56 + 16
x • 8 = 72
x = 72 : 8
x = 9
9 • 8 – 16 = 56
56 = 56

510 : x = 170 : 10
510 : x = 17
x = 510 : 17
x = 30
510 : 30 = 17
17 = 17

320 : (x – 28) = 8
x – 28 = 320 : 8
x – 28 = 40
x = 40 + 28
x = 68
320 : (68 – 28) = 8
8 = 8

x + 45 – 37 = 84
x + 8 = 84
x = 84 – 8
x = 76
76 + 46 – 37 = 84
84 = 84