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30 55 - x
---- = ---------
40 60
180 = 220 - 4x
4x = 40
x = 10 cm
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50 35 - x
---- = ---------
60 40
200 = 210 - 6x
6x = 10
x = 10/6 = 1⅔ cm
60 (35-x) = 40 (50)
2100 - 60x = 2000
-60x = 2000 - 2100
-60x = -100
60x = 100
x = 5/3
x = 16,67