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The perimeter of a triangle is 18p+12q+13r and two of its sides are 5p+3q-4r and 6p+5q+7r. Find the third side.
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perimeter of triangle= sum of three side
18p+12q+13r=5p+3q-4r+6p+5q+7r +third side
18p +12q +13r=11p+8q+3r + third side
18p +12q +13r-(11p+8q+3r)=third side
18p +12q +13r-11p-8q-3r= third side
7p +4q +10r = third side ANS....
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