The perimeter of a triangle is 5a²+3a_1 two of it side are 2a+5+7a²and 3a²+4a find the third side
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Let the third side be x
Alq ,
5a2+ 3a - 1 = 2a + 5+7a2 + 3a2 +4a +x
5a2 + 3a -1 = 6a + 10 a2 +5+x
5a2 - 10a2 + 3a - 6a -1 -5 = x
-5a2 - 3a -6 = x
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