1. 3 (5 - 2x) = - 2 (6 - 3x) - 10x

2. 1/4x - 2/5x = 39

3. 115 = 20 + 2.5x

4. 0.7x - 0.2 = 8.3x + 7.2

x = - 260

x = - 37/38

x = 38

x = 13.5

1.) 3 (5 - 2x) = - 2 (6 - 3x) - 10x

15 - 6x = - 12 + 6x - 10x

-6x - 6x + 10x = - 12 - 15

-2x = - 27

x = - 27/-2 = 13.5

x = 13.5

2.) 1/4x - 2/5x = 39

-3/20x = 39

x = (39 x 20) / - 3 = - 260

x = - 260

3.) 115 = 20 + 2.5x

2.5x = 115 - 20 = 95

x = 95/2.5 = 38

x = 38

4.) 0.7x - 0.2 = 8.3x + 7.2

8.3x - 0.7x = - 0.2 - 7.2 = - 7.4

7.6x = - 7.4

x = - 7.4/7.6 = - 37/38

x = - 37/38