tolong yaa sama caranya yang nomor 16

4a = 130
a = 130/4
a = 32,5

3b - 9 = 81
3b = 81 + 9
3b = 90
b = 30

2c + 11 + 81 = 180
2c + 92 = 180
2c = 180 - 92
2c = 88
c = 44

5x + 4 = 49
5x = 49 - 4
5x = 45
x = 9

8y - 5 + 49 = 180
8y + 44 = 180
8y = 180 - 44
8y = 136
y = 17

cmiiw