Final answer:
To simplify the expression −(18+5w)−(5w−7z), remove the parentheses and combine like terms. The simplified expression is -10w + 7z - 18.
Step-by-step explanation:
To simplify the expression −(18+5w)−(5w−7z), we need to remove the parentheses and combine like terms.
The expression inside the first pair of parentheses is 18+5w. When we distribute the negative sign outside the parentheses, it becomes -18-5w.
The expression inside the second parentheses is 5w−7z. When we distribute the negative sign outside the parentheses, it becomes -5w+7z.
Combining like terms, we have -18-5w - 5w+7z.
Adding the coefficients of the like terms, we get -10w + 7z - 18.