123456789×123456789-123456788×123456790=?

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123456789×123456789-123456788×123456790=?123456789×123456789-123456788×123456790=?123456789×12345678

123456789×123456789-123456788×123456790=?
123456789×123456789-123456788×123456790=?

123456789×123456789-123456788×123456790=?
123456789×123456789-123456788×123456790
=123456789×123456789-123456789×123456788-123456788
=123456789-123456788
=1