Answer:
w = 9
Explanation:
Isolate variable by adding 7 to both sides
9w = 81
Divide both sides by 9 to get w alone
Check
9(9) - 7 =74
81-7 = 74
74 = 74
Answer: 9
Add 7 to 74, which gives you 81. Then divide by 9 for the value of w and you get 9.
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