a) 2x + 2 = 92x = 7x = 7/2
б) 2x + 7 = 112x = 4x = 2
в) 3x - 5 = 403x = 45x = 15
г) 2x + 11 = 212x = 10x = 5
a) 2x + 2 = 9
2x = 7
x = 7/2
б) 2x + 7 = 11
2x = 4
x = 2
в) 3x - 5 = 40
3x = 45
x = 15
г) 2x + 11 = 21
2x = 10
x = 5