(х - 300) + 800= 1400;
х - 300= 1400- 800;
х - 300= 600;
х = 600 + 300;
х = 900;
(w + 7250) - 3250 = 20 870;
w + 7250= 20 870 - 3250;
w + 7250 = 17 620;
w = 17 620 - 7250;
w = 10370;
6400 - (1700 + y) = 2500;
1700 + y= 6400- 2500;
1700 + y = 3900;
y = 3900 - 1700;
y = 2200;
(х - 300) + 800= 1400;
х - 300= 1400- 800;
х - 300= 600;
х = 600 + 300;
х = 900;
(w + 7250) - 3250 = 20 870;
w + 7250= 20 870 - 3250;
w + 7250 = 17 620;
w = 17 620 - 7250;
w = 10370;
6400 - (1700 + y) = 2500;
1700 + y= 6400- 2500;
1700 + y = 3900;
y = 3900 - 1700;
y = 2200;