Question

Combine like terms to create an equivalent expression: 4z-(-3z)

Answer 1

The answer is:  " 7z " .
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Note:  " 4z - (-3z)  = ? " ; 

Note that "subtracting a negative" is the same thing as "adding a positive" ;

→  " 4z - (-3z)  = 4z + 3z = 7z .
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The answer is:  " 7z " .
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Answer 2

7z. 2 negs make a pos. But two wrongs do not make a right.