tolong aku pleaseeeeeeeeee

(a)
(8+a) / 10 = 8 / 6
(8+a) / 10 = 4 / 3
3(8+a) = 10 x 4
24 + 3a = 40
3a = 40 - 24
3a = 16
a = 16/3

(b)
(b+5) / 5 = b / 2
2(b + 5) = 5 . b
2b + 10 = 5b
5b - 2b = 10
3b = 10
b = 10/3

(c)
(4 + c) / 8 = c / 5
5(4 + c) = 8 . c
20 + 5c = 8c
8c - 5c = 20
3c = 20
c = 20/3

(d)
(d + 6) / 12 = d / 4
4(d + 6) = 12. d
4d + 24 = 12d
12d - 4d = 24
8d = 24
d = 3