Ответы и объяснения

2013-11-29T17:52:43+00:00
0,3x + 8 = 2
0,3x = -6
x = -20

4x + 7 = 5
4x = -2
x = -0,5

3x + x + 5x = 2,1
9x = 2,1
x = 0,24
2013-11-29T17:54:21+00:00
0.3х+8=2
0.3х= -6
х=-6:0.3
х=-20

4х+7=5
4х=-2
х=-0.5

3х+х+5х=2.1
9х=2.1
х=2.1:9
х=0.23