tolong bantu jawab ya kak makasih:)

1. 5u + 3 = 2u + 15
3u= 12
u = 4

2. 2u-3 = 9 + 6u
-4u = 12
u = -3

3. 5(u+6) = 3(u+4)
5u + 30 = 3u + 12
2u = -18
u = -9

4. 3(2u - 5) = 9
6u - 15 = 9
6u= 24
u = 4

5. -2/3 u = -6
kedua ruas kalikan 3
-2u = -18
u = 9