7/12у=2 1/4
7/12у=9/4
у=9/4:7/12
у=9/4*12/7
у=27/7=3 6/7
15/68 : x = 10/51
х=15/68:10/51
х=15/68*51/10
х=9/8=1 1/8
7/12у=2 1/4
7/12у=9/4
у=9/4:7/12
у=9/4*12/7
у=27/7=3 6/7
15/68 : x = 10/51
х=15/68:10/51
х=15/68*51/10
х=9/8=1 1/8