w = 11 is your answer.
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Steps:
Take the original equation and add 11 to both sides. Simplify which will look like this: 3/7w = 4/7w + 11
Next add 4w to both sides which will look like: 3/7w + 4/7w = -4/7w + 11 + 4/7w next, simplify once more. Which will be your answer, which is, w = 11.