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Question
Subtract:
`4/7-(-8)/9-(-13)/7+17/9`
Sum
Solution
`4/7-(-8)/9-(-13)/7+17/9`
⇒ `(4/7-(-13)/7)-((-8)/9-17/9)`
⇒ `(4/7+13/7)-((-8)/9-17/9)`
⇒ `17/7-((-25)/9)`
⇒ `17/7+25/9` (∴LCM of 7 and 9 = 63)
⇒ `(17xx9+25xx7)/63`
⇒ `(153+175)/63` ⇒ `328/63` ⇒ `5 13/63`
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