Tolong dijawqb secepetnya poin nya banyak lo..

3a=21
a= 7

3b=18
b=6

3(3a+18) = 4(10a-2)
9a+54=40a-8
31a=62
a=2

1.3a+5 =26
3a = 26-5
a=21/3
a= 7
2.7b-4 = 4b+14
7b-4b=14+4
3b = 18
b=18/3
b=6