(4z+8)-(-7z+9)
Apply the distributive property.
4z+8-(-7z)-1⋅9
Multiply -7 by -1.
4z+8+7z-1⋅9
Multiply -1 by 9.
4z+8+7z-9
4z+8+7z-9
Add 4z and 7z.
11z+8-9
Subtract 9 from 8.
11z-1
11z-1
Simplify (4z+8)-(-7z+9)
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