9(a+b)the whole cube - 25(a+b)
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(9(a+b))³ - 25(a+b)
= 9³ ( a + b)³ - 25 ( a + b)
= 729 ( a³ - 3a²b + 3ab² - b³) - 25 ( a + b )
= 729a³ - 2187a²b + 2187ab² - 729b³ - 25a + 25b
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