Решите уровнение: найдите корень!

400+F:80=600

500*x-600=400

1300 - (b+800) = 400

600*20-n=60

(600-500) : y=20

d: (1300-800) = 4

1) 400 : 80 = 50

600 : 50

2) 400 + 600 = 1000

1000 : 500 = 2

3) 1300 - 400 = 900

900 - 800 = 100

4) 600 * 20 = - 12000

12000 - 60 = 11940

5) 600 - 500 = 100

100 : 20 = 5

6) 13300 - 800 = 500

500 * 4 = 2000

400+F:80=600

F:80=600-400

F:80=200

F=200*80

F=16000

500*х-600=400

500 х-600=400

500 х=400+600

500 х=1000

х=1000:500

х=2

1300 - (ь+800) = 400

ь+800=1300-400

ь+800=900

ь=900-800

ь=100

600*20-n=60

1200-n=60

n=1200-60

n=1140

(600-500) : у=20

100:у=20

у=100:20

у=5

d: (1300-800) = 4

d:500=4

d=4*500

d=2000