Basic Mathematics problem # 2

Algebra Level 4

Find solutions of a, b, c, d in ordered pairs in the following system.

a + b + c + d = 12

abcd = 27 + ab + ac + ad + bc + bd + cd

Note - Give your answer as in the following example- if solutions are (a, b, c, d) = (1,2,3,4) and (9,8,7,6), then your answer will be 1+2+3+4+5+6+7+8+9 = 45

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