Частина 2. Номер 517
x – 7 • 8 = 46
x – 56 = 46
x = 46 + 56
x = 102
102 – 56 = 46
46 = 46
x • 9 – 28 = 35
x • 9 = 35 + 28
x • 9 = 63
x = 63 : 9
x = 7
7 • 9 – 28 = 35
35 = 35
56 – 39 + x = 90
17 + x = 90
x = 90 – 17
x = 73
56 – 39 + 73 = 90
90 = 90
(54 : 9) • x = 540
6 • x = 540
x = 540 : 6
x = 90
(54 : 9) • 90 = 540
540 = 540