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.