Подскажите решение 1) 3*620-x=54200 2) 63:(14-f)=7 3) 3*a-7=14 4) 875*4-x=2600

1) 3*620-x=54200 1860 - x = 54200 - x = 54200 - 1860 - x = 52340 x = -52340 2) 63/(14-f) = 7 14-f = 63/7 14-f=9 -f=9-14 -f=-5 f=5 3) 3a-7=14 3a=21 a=21/7 a=3 4) 875*4-x=2600 3500 - x = 2600 -x = 2600-3500 -x = -900 x=900