7/8=х/6
8 * х = 7 * 6
8х=42
Х=42:8=42/8=21/4=5 1/4
13/15=Х/10
15 * х = 13 * 10
15х=130
Х=130:15=26:3=26/3= 8 2/3
12/21=х/14
12*2/21*2=х*3/14*3
24/42=3х/42
3х=42
Х = 42:3=14
48/51=х/34
51*х=48*34
Х=48*34/51=48*2/3=16*2= 34.
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7/8=х/6
8 * х = 7 * 6
8х=42
Х=42:8=42/8=21/4=5 1/4
13/15=Х/10
15 * х = 13 * 10
15х=130
Х=130:15=26:3=26/3= 8 2/3
12/21=х/14
12*2/21*2=х*3/14*3
24/42=3х/42
3х=42
Х = 42:3=14
48/51=х/34
51*х=48*34
Х=48*34/51=48*2/3=16*2= 34.