помогите решить уравнения!!!

1)
6q + 3q = 900.072
9q = 900.072
q = 900.072 : 9
q = 100.008
проверка:
6 * 100.008 + 3 * 100.008 = 900.072
600.048 + 300.024 = 900.072
900.072 = 900.072

2)
а : (27 : 9) = 222.222
а : 3 = 222.222
а = 222.222 * 3
а = 666.666
проверка:
666.666 : (27 : 9) = 222.222
666.666 : 3 = 222.222

3)
87t - 79t = 20 * 10
8t = 200
t = 200 : 8
t = 25
проверка:
87 * 25 - 79 * 25 = 20 * 10
2.175 - 1.975 = 200
200 = 200

4)
х - 5 = 3.000 * 30
х - 5 = 90.000
х = 90.000 + 5
х = 90.005
проверка:
90.005 - 5 = 3.000 * 30
90.000 = 90.000

1)9q=900072
q=900072/9
q=100008
2)8t=200
t=200/8
t=25
3)a/3=222222
a=666666
4)x-5=900000
x=900000+5
x=900005