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k=2 (3x-2) + 2 (x+3)
k= 6x - 4 + 2x + 6
k= 8x + 2
42 = 8x + 2
42 - 2 = 8x
40 =8x
x=40/8
x= 5
p=(3x-2)
p=(3.5 - 2)
p=15 - 2
p= 13
42= 2 (3x - 2 + x + 3)
42= 2 ( 4x +1)
42= 8x + 2
42 - 2 = 8x
40 = 8x
x= 5
jadi panjang = 3x - 2
= 3(5) - 2
= 15 - 2 = 13