The expression is .

                              (Product of two same signs is positive)

Mixed fractions can be written as improper fractions.

                              ()

                              ()

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 35.

Rewrite the equivalent fractions using the LCD.

Rewrite the expression using the LCD.

Denominators are same, write sum of numerators over denominator.

                                (Add numerator: )

The sum is .