Solving a = d+c/b for d.?

Question

1. d = ab - c

2. d = ab + c

3. d = a/b - c

Answer 1

a = (d + c)/b

d + c = ab

d = ab - c

Answer: 1. d = ab - c

Answer 2

it is number 1.....because it is like

a=d+c/b

ab=d+c/b times b   times both sides by b

ab=d+c

ab-c=b+c-c         subtract c from each side

ab-c=b    

you can switch it around of course....d=ab-c......easy stuff once you understand it

Answer 3

a = (d + c)/b

ab = d + c

d = ab - c

(answer number 1)