Найдите корень уравнения:

1) 9 (x - 1) = x + 15

2) (11x + 14) - (5x - 8) = 25

3) 12 - 4 (x - 3) = 39 - 9x

4) 2 (3x + 5) - 3 (4x - 1) = 11,8

1.

9 (x - 1) = x + 15

9x-9=x+15

9x-x=15+9

8x=24

x=24/8

x=3

2.

(11x + 14) - (5x - 8) = 25

11x+14-5x+8=25

11x-5x=25-14-8

6x=3

x=3/6

x=0.5

3.

12 - 4 (x - 3) = 39 - 9x

12 - (4x-12) = 39-9x

12-4x+12=39-9x

-4x+9x=39-12-12

5x=15

x=15/5

x=3

4.

2 (3x + 5) - 3 (4x - 1) = 11,8

6x+10-12x+3=11.8

6x-12x=11.8-10-3

-6x=-1.2

x=-1.2 / (-6)

x=0.2