Simplify 9x + 3y − 6 − 5x + 4y −3.

To simplify 9x + 3y - 6 - 5x + 4y - 3, we can combine like terms:

(9x - 5x) + (3y + 4y) + (-6 - 3)

Simplifying further:

4x + 7y - 9

12e − 5f − 7e +3f .

To simplify 12e - 5f - 7e + 3f, we can combine like terms:

(12e - 7e) + (-5f + 3f)

Simplifying further:

5e - 2f

Simplify 9/11z − 4/11z

To simplify 9/11z - 4/11z, we can combine like terms:

(9/11z - 4/11z)

Simplifying further:

(9 - 4)/11z

The simplified expression is:

5/11z

Simplify  3/10x + 1/6y + 3/10x + 3/6y .  Be sure to reduce any fractions to the lowest terms.

To simplify 3/10x + 1/6y + 3/10x + 3/6y, we can combine like terms:

(3/10x + 3/10x) + (1/6y + 3/6y)

Simplifying further:

(6/10x) + (4/6y)

Simplifying the fractions:

(3/5x) + (2/3y)

Therefore, the simplified expression is:

3/5x + 2/3y