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= (2 (3x - 7)) + (2 (4 - 2x))
= (6x - 14) + (8 - 4x)
= (6x - 4x) + (-14 + 8)
= 2x + -6
maka keliling PP tsb= 2(3x-7+4-2x)=6x-14+8-4x= 2x-6