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panjang = l + 3
K < 90 cm
lebar = x
maka :
K < 2 x (p+l)
90 > 2 x (x+3+x)
90 > 2x (2x+3)
90 > 4x + 6
90-6 > 4x
84 > 4x
x < 84/4
x < 21