A + B + C + D = 100
A * 4 = E ... A = E/4
B/4 = E ... B = 4E
C + 4 = E ... C = E - 4
D - 4 = E ... D = E + 4
(E/4) + (4E) + (E-4) + (E + 4) = 100
E/4 + 6E = 100 ... multiply by 4
E + 24E = 400
25E = 400
E = 400/25
E = 16 <===
A = E/4 = 16/4 = 4
B = 4E = 4 (16) = 64
C = E - 4 = 16 - 4 = 12
D = E + 4 = 16 + 4 = 20
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