《Salut,》
6 × 4 + a = 31
a = 31 - ( 6 × 4 )
a = 31 - 24
a = 7
Proba:
6 × 4 + 7 = 31 ✔
4 × 8 - a = 28
a = ( 4 × 8 ) - 28
a = 32 - 28
a = 4
Proba:
4 × 8 - 4 = 28 ✔
9 × 5 + a = 83
a = 83 - ( 9 × 5 )
a = 83 - 45
a = 38
Proba:
9 × 5 + 38 = 83 ✔
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