Question

2/3x=1, 5x=1/6,4x=1/4, 7x=20

Answer 1

2/3x=1      
2=3х * 1 
х=2/3
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 5x=1/6
х= 1/6 : 5
х= 1/30
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4x=1/4
х=1/16
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7x=20
х=20/7 = 2$frac{6}{7}$