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3/5 * x/4 = 3
3x/20 = 3
3x = 60
x = 20
2.
12 * 9/x = 5 2/5
108/x = 27/5
27x = 540
x = 20
3.
x/20 : 3/4 = 6
x/20 * 4/3 = 6
x/15 = 6
x = 90