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40= 2 (3x +4 + x + 6 )
40 = 2 ( 4x + 10 )
40 = 8x + 20
40 - 20 = 8x
20 = 8x
x = 20/8
x = 2,5
jadi, panjang = 3x+4 = 3(2,5) +4 = 11, 5cm
lebar = x + 6 = 2,5 + 6 = 8,5 cm
semoga membantu :)