Negative balance is .

                        (Add deposit amount)

Both have different signs, so subtract the lesser absolute value from greater absolute value.

                   (Different signs: Subtract  from )

                                    (Since , the sum has the same sign as )

                            (Subtract check amount)

Both have different signs, so subtract the lesser absolute value from greater absolute value. 

                    (Different signs: Subtract  from )

                                   (Since , the sum has the same sign as )

The balance is $63. 

The balance is $63.