d=17
the answer is a
10
-6
a+b+c+d+e = 30 (i) c+e = 14 (ii) d+b = 1 (iii) a = 2b-1 (iv) a+c = 10 (v) By (i)-(ii)-(iii): a = 15 then, by (iv): b = 8 and by (v): c = -5 Also, b = 8 so by (iii): d = -7 and then by (i), e = 19
If: d+7 = 5 Then: d = -2 by subtracting 7 from both sides
c = 6 and d = 7
7=dd=3 so 7 goes by 3+d = cC=cost and so it equals 10+1902 =1912
4
Commutativity.
If: df+10f = 3 Then: f(d+10) = 3 And: d = 3/f -10
That's the equation.
Doc, Happy, Grumpy, Sleepy, Bashful, Sneezy and Dopey equal[s] the 7 dwarves.