1) 12-7 = 55 + Х + 4 = 125 + Х + 4 = 12Х + 9 = 12Х = 3
2) 27-1 = 2626 - 5 + Х - 6 = 2020 + Х - 6 = 20Х - 6 = 0Х = 6
1) 12-7 = 5
5 + Х + 4 = 12
5 + Х + 4 = 12
Х + 9 = 12
Х = 3
2) 27-1 = 26
26 - 5 + Х - 6 = 20
20 + Х - 6 = 20
Х - 6 = 0
Х = 6