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-p=2x+3
-lebar=x+8
keliling= 2p + 2l
64 = 4x+6 + 2x+16
64 = 6x + 22
64-22 = 6x
42 = 6x
7=x
p=2x + 3 = 17 cm
NB:itu tanda tambah jadinya kurang,gk tau kok bisa gitu, ngetiknya tambah tapi munculnya kurang