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keliling = (2x-3) + (3x +1) + (3x +1)
= 2x + 3x + 3x -3 + 1 + 1
= 8x - 1
k = (2x + 3) + 2.(3x+1)
= (2x + 3) + (6x + 2)
= 2x + 6x + 3 + 2
= 8x + 5