Ответы и объяснения

2011-03-15T22:58:55+03:00

4x+40=6x-40;                                      6x-15=4x+5;

4x-6x=-40-40;                                     6x-4x=15+5;

-2x=-80                                               2x=20;

x=-80:(-2)                                           x=20:2;

x=40.                                                  x=10.

Ответ:x=40.                                        Ответ:х=10.

2011-03-16T00:37:44+03:00

1)6x-4x=40+40

    2x=80

    x=80/2

    x=40

 

2)6x-4x=5+15

    2x=20

    x=20/2

    x=10