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12(x + 2) ≤ 180
12x + 24 ≤ 180
12x ≤ 180-24
12x ≤ 156
12x : 12 ≤ 156 : 12
x ≤ 13
maka, x maksimal = 13
maka panjang rusuk maksimal adalah
x + 2 = 13 + 2 = 15 cm