The expression is .

                              (Product of two same signs is negative) \ \

Mixed fraction can be written as improper fraction.

                              () \ \

                                () \ \

To add fractions the denominators must be equal.

Find the least common denominator (LCD).

Write the prime factorization of each denominator.

Multiply the highest power of each factor in either number.

LCD of the fractions is 20.

Rewrite the equivalent fractions using the LCD.

Rewrite the expression using the LCD.

Denominators are same, write difference of numerators over denominator.

                                       (Subtract the numerator: )

The sum is .