perimeter of triangle is 3 X + 4 Y and the two sides of triangle are 3 Y + 4 x and 4 + 6 x find the third side
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Lengh of third side = perimeter - sum of length of 2 side
= 3x + 4y - (3y+4x+4y+6x)
= 3x + 4y - 7y - 10x
= -3y -7x
= -(3y+7x)
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