3 вариант а) 66 -5х = -9
б) 11 + 3x = 55 + 4х;
в) –15 – 4х = -8х + 45;
г) –8x – 17 = 3х – 105.

–8x – 17 = 3х – 105.

Пошаговое объяснение:

Если не правильно прости

а) 66- 5x= -9

5x = -9 - 66

5x = -75

x = -75:5

x = -15

б) 11 + 3x = 55 + 4х

3x-4x = 55 - 11

-x = 44

44 = x

x = 44

в) –15 – 4х = -8х + 45

-4x + 8x = 45 + 15

-4x + 8x = 60

4x = 60

x = 60:4

x = 15

г) –8x – 17 = 3х – 105

-8x - 3x = -105 + 17

-8x - 3x = -88

88 = 8x + 3x

88 = 11x

11x = 88

x = 88:11

x = 8