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40cm = 6x + 4
6x = 40-4
6x = 36 cm
x = 36:6
x= 6
40 cm = 2( 2x + 4 cm+ x - 2cm )
40 cm = 6x + 4 cm
36 cm = 6x
6 cm = x
panjang = 2x+4
= 2(6)+4
= 12+4
= 16 cm
lebar = x - 2
= 6 - 2
= 4 cm