Решите уравнение 1) 9x + (7x+5) - (2x-3) = x+7 2) 3x - (8+9x) - (5x-4) = - 7x 3) x-15,5+8x - (13x+16,5) = 12x 4) 6x - (2x+13) - (x-7) = 15x

1) 9x + (7x+5) - (2x-3) = x+7

9 х+7 х+5-2 х+3=х+7

14 х+8=х+7

14 х-х = 7-8

13 х=-1

х = - 1/13

2) 3x - (8+9x) - (5x-4) = - 7x

3 х-8-9 х-5 х+4=-7 х

-11 х-4=-7 х

11 х-7 х=-4

3 х=-4

х=-4/3

3) x-15,5+8x - (13x+16,5) = 12x

х-15,5+8 х-13 х-16,5=12 х

-4 х-32=12 х

12 х+4 х=-32

16 х=-32

х=-32/16

х=-2

4) 6x - (2x+13) - (x-7) = 15x

6 х-2 х-13-х+7=15 х

3 х-6=15 х

15 х-3 х=-6

12 х=-6

х=-6/12

х=-1/2