7 × (n - 8) = 7 × n - 7 × 8 = 7n - 56
7 × ( n - 8 ) = 7 × n + 7 × ( -8 ) = 7n - 56
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7 × (n - 8) = 7 × n - 7 × 8 = 7n - 56
7 × ( n - 8 ) = 7 × n + 7 × ( -8 ) = 7n - 56