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= 2 (2x+p) - (3x-2p) - (x+p)
= 4x + 2p - 3x + 2p - x - p
= (4-3-1)x + (2+2-1)p
= 0x + 3p
= 3p
misalkan pjg sisi 3 = A , maka
jadi sisi 3 panjangnya adalah 3p
semoga dapat membantu