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58=(5x+4)+(5x+4)+(4x-2)+(4x-2)
58=5x+4+5x+4+4x-2+4x-2
58=18x+4
58-4=18x
54=18x
x=54/18
x=3
58 = 2p + 2l ; 58 = 2 (5x+4) + 2(4x-2)
58 = 10 x + 8 + 8x -4
58 = 18x +4
18 x =54
x = 3 cm
*jadikan jawaban terbaik ya :)