(w+7250)-3250=20 870
раскроем скобки
w+7250-3250 = 20870
w-16870 = 0
w = 16870
(x-300)+800=1400
x-300+800 = 1400
x-900 = 0
x = 900
6400-(1700+y)=2500
6400-1700-y = 2500
-y+2200 = 0
y-2200 = 0
y = 2200
25 620+(13 200-z)=30000
25620+13200-z = 30000
-z+8820 = 0
z-8820 = 0
z = 8820
(w+7250)-3250=20 870
раскроем скобки
w+7250-3250 = 20870
w-16870 = 0
w = 16870
(x-300)+800=1400
раскроем скобки
x-300+800 = 1400
x-900 = 0
x = 900
6400-(1700+y)=2500
раскроем скобки
6400-1700-y = 2500
-y+2200 = 0
y-2200 = 0
y = 2200
25 620+(13 200-z)=30000
раскроем скобки
25620+13200-z = 30000
-z+8820 = 0
z-8820 = 0
z = 8820