Combine like terms. 2z+9-z+3

z + 12

Step-by-step explanation:

Combine like terms (terms with the same amount of variables).

2z + 9 - z + 3

(2z - z) + (9 + 3)

z + 12

z + 12 is your answer.

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z + 12

Step-by-step explanation:

This is the answer because:

1) Our like terms are 2z and z and 9 and 3

2) First, we should add 9 and 3 because they are like terms and there is a + sign in front of the 3 which equals to 12

3) Then, subtract 2z and z because they are like terms and there is a - sign in front of the z which equals to z

4) Finally, we are left with z + 12. This expression is simplified because there is no more like terms

Hope this helps!

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step-by-step explanation: