The answer to the question is 5z + 1
(3z - 4) + (2z + 5)
If we open the brackets, we have something like this
3z - 4 + 2z + 5
then we collect like terms, so that
3z + 2z + 5 - 4
proceeding further, we have
5z + 1
therefore, our answer is 5z + 1
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