2:5=x:20
5x=2*20
5x=40
х=40:5
х=8
10х:21=6:7
10х*7=21*6
70х=126
х=126:70
х=1,8
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2:5=x:20
5x=2*20
5x=40
х=40:5
х=8
10х:21=6:7
10х*7=21*6
70х=126
х=126:70
х=1,8