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x : 21 = 4 /x21
x = 84
2)
x : 5 = 9 /x5
x = 45
3)
5x:2=18 /x2
5x = 36 /:5
x = 7,2
4)
36:x=28 /x x
36 = 28x /:28
x = 1 2/9
5)
20:x=35 / x x
35x = 20 /:35
x = 4/7
6)
70:3x=7 / x 3x
3x x 7 = 70
21x = 70 /:21
x = 3 1/3
2) 45
3)1,8
4)1,29
5)1,75
6)0,(3)