6 → ×6 → 36
6 ×10 → -24=36
7 → ×10 → 70
8 → ×10 → -10=70
9 ×9=81
9 ×10 -9=81
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6 → ×6 → 36
6 ×10 → -24=36
7 → ×10 → 70
8 → ×10 → -10=70
9 ×9=81
9 ×10 -9=81