Slot machine giant Scientific Games Corp. said Thursday it closed out 2015 with a 10 percent increase in fourth quarter revenue while the company sliced $231 million from the bottom line after completing the $5.1 billion acquisition of rival Bally Technologies. Accounting and financial activities surrounding the Bally merger caused Las Vegas-based Scientific Games to suffer a net loss of $128 million in the quarter that ended Dec. 31, which included noncash impairment charges totaling $130 million.