Реши уровнения: (x-300) + 800=1400 6400 - (1700+y) = 2500 (w+7250) - 3250=20870 25620 + (13200-z) = 30000

(x - 300) + 800 = 1400;

х - 300 + 800 = 1400;

х = 1400 + 300 - 800;

х = 900;

Подставим вместо х, его значение:

(900 - 300) + 800 = 1400;

600 + 800 = 1400;

1400 = 1400.

6400 - (1700 + y) = 2500;

6400 - 1700-y = 2500;

-y + 4700 = 2500;

-y = 2500 - 4700;

-y = - 2200;

-y * (-1) = - 2200 * (-1);

y = 2200;

6400 - (1700 + 2200) = 2500;

6400 - 3900 = 2500;

2500 = 2500.

(w + 7250) - 3250 = 20870;

w + 7250 - 3250 = 20870;

w + 4000 = 20870;

w = 20870 - 4000;

w = 16 870;

(16870 + 7250) - 3250 = 20870;

24120 - 3250 = 20870;

20870 = 20870.

25620 + (13200 - z) = 30000;

25620 + 13200 - z = 30000;

-z + 38820 = 30000;

-z = 30000 - 38820;

-z = - 8820;

-z * (-1) = - 8820 * (-1);

z = 8820;

25620 + (13200 - 8820) = 30000;

25620 + 4380 = 30000;

30000 = 30000.