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10x = 40
x = 4
p : 3x4 = 12
l : 2x4 = 8
L : 12x8 = 96
2(p+l)=40
2(3x+2x)=40
10x=40
x=4
luas=p . l = 3x . 2x=6x²=6 . 4²=96