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125 min
x = 20, because 130 + 30 = 160 and 180 - 160 = 20
x = 340, because 130 + 30 = 160 and 160 + 180 = 340
x = 80, because 180 - 130 = 50 and 50 + 30 = 80
x = 160, because 180 - (130 + 30) = 20 and 180 - 20 = 160
