Hello there!
[tex]w-7=11[/tex]
Explanation:
↓↓↓↓↓↓↓↓↓↓
First you had to add by 7 from both sides of the equation.
[tex]w-7+7=11+7[/tex]
Simplify it should be the correct answer.
[tex]w=18[/tex]
Answer⇒⇒⇒⇒⇒⇒w=18
Hope this helps!
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-Charlie