Ответы и объяснения

2013-05-13T08:26:54+04:00

7х-(3+2х) = х+9

7x-3-2x = x+9

7x-2x-x = 9+3

4x = 12

x = 3

 

3х-(10-9х) = 22

3x-10+9x = 22

3x+9x = 22+10

12x = 32

x = 32/12 = 16/6 = 8/3 = 2 2/3

2013-05-13T08:28:12+04:00

7х-3-2х=х+9

7х-2х-х=9+3

4х=12

х=12:4

х=3

 

3х-10+9х=22

3х+9х=22+10

12х=32

х=32:12

х=2 2/3