SOLUTION: solve w/9-w/21=1/9

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Question 383848: solve w/9-w/21=1/9
Answer by mananth(16946) About Me  (Show Source):
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w/9-w/21=1/9
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%28w%2F9%29-%28w%2F21%29=1%2F9
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%2821w-9w%29%2F%2821%2A9%29=1%2F9
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%2812w%29%2F%2821%2A9%29=+1%2F9
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multiply by 9
%2812w%2A9%29%2F%2821%2A9%29=+1%2A9%2F9
12w%2F21=1
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multiply by 21
12w=21
/12
w= 21/12
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