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6/28 = 18/x

6 * x = 18 * 28

6x = 504

x = 504/ 6

x = 84

7/28 = 18/x

7x = 18 * 28

7x = 504

x = 504/ 7

x = 72

x/35 = 21/5

x/35 = 4,2

x = 4,2 * 35

x = 147

4,5/x = 10/6

x * 10 = 4,5 * 6

10x = 27

x = 27/10

x = 2,7

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