18:4=18/4=4 2/4=4 1/2
24:9=24/9=2 6/9=2 2/3
52:32=52/32=1 20/32=1 5/8
65:10=65/10=6 5/10=6 1/2
78:18= 78/18=4 6/18=4 1/3
99:55=99/55=1 44/55=1 4/5
3 8 4 88 5 888 6 8888 7 …
3/5 * (7/9х - 1/3) = х - 2 1/3; 7/15х - 1/5 = х - 2 1/3; - 1/5 + 2 1/3 = х + 7/15х; 2 5/15 - 3/15 = 1 7/15х; 2 2/15 = 1 7/15х; х = 2 2/15 : 1 7/15; х = 32/15 : 22/15; х = 32/15 * 15/22; х = 16/11; х = 1 5/16.