Пошаговое объяснение:
1)7x + 2x = 27
9x = 27
x = 3
2) 16x-4х=60
12x = 60
x = 5
3) 7x -5 x = 70
2x = 70
x = 35
4) 4x + 12х = 20 + 12
16x = 32
x = 2
5) x + 123 = 562
х=439
6) 621 - х=235
х=386
Пошаговое объяснение:
1)7x + 2x = 27
9x = 27
x = 3
2) 16x-4х=60
12x = 60
x = 5
3) 7x -5 x = 70
2x = 70
x = 35
4) 4x + 12х = 20 + 12
16x = 32
x = 2
5) x + 123 = 562
х=439
6) 621 - х=235
х=386