a= 3

b= 2

d= 5

a=4b + (6/ c-1)- 15d

okey so il show how far i am. could someone please tell me where im goin wrong. many thanks

3= (8) + (6/ C-1) - 75

75+3 = 8+ (6/ C-1)

78 = 8 + (6/ C-1)

78-8 = (6/C-1)

70 = (6/C-1)

C-1 (70) = 6

C (70) = 7

C= (7/70)

C= 0.1