Provide the operators (?) and the solutions (a, b, ..., f) in the equations. The software will discover the digits x1, ..., x9.
x1 ? x2 ? x3 = a
? ? ?
x4 ? x5 ? x6 = b
? ? ?
x7 ? x8 ? x9 = c
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d e f
xi is an integer in {1, ..., 9}. Digits may not repeat. ? represents an operator from the set {+, -, /, *}.
