Odpowiedź :
Równanie 1:
[tex]5x -28 = 12 \ \ \ \ \ / +28\\5x = 40 \ \ \ \ \ /:5\\x = 8[/tex]
Równanie 2:
[tex]12x - 4 - 8x = 12\\4x-4 = 12 \ \ \ \ /+4\\4x = 16 \ \ \ \ /:4\\x = 4[/tex]
5x - 28 = 12
5x = 12+28
5x= 40/:5
x= 8
12x - 4 - 8x = 12
12x - 8x = 12 + 4
4x = 14/ :4
4x = 3,5 lub 14/4
5x = 12+28
5x= 40/:5
x= 8
12x - 4 - 8x = 12
12x - 8x = 12 + 4
4x = 14/ :4
4x = 3,5 lub 14/4