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Simplify the expression    
simplifying an expression

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num  (3t−5a)(3t+5a)         
den 6t2 +9at+10at+15a2
    =3t(2t+3a) +5a(2t+3a)
    =(3t+5a)(2t+3a)         
(3t−5a)(3t+5a)  = 3t−5a
(3t+5a)(2t+3a)     2t+3a

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