Реши уравнения:
20007 − x = 20000;
x − 900 = 1000;
x + 200 = 3200;
300 + x = 5400.
20007 − x = 20000
x = 20007 − 20000
x = 7
x − 900 = 1000
x = 1000 + 900
x = 1900
x + 200 = 3200
x = 3200 − 200
x = 3000
300 + x = 5400
x = 5400 − 300
x = 5100