5,4 : 7 1/2 = x : 0,5
54/10 * 2/15 = x *5/10
5/10 x = 54/75 /*10/5
x = 540/375
x = 1 165/375
x = 1 33/75 = 1 11/25
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5,4 : 7 1/2 = x : 0,5
54/10 * 2/15 = x *5/10
5/10 x = 54/75 /*10/5
x = 540/375
x = 1 165/375
x = 1 33/75 = 1 11/25