2/3:x=3 3/5
2/3:x=18/5
x=2/3:18/5
x=2*5/3*9
x=5/27
375*0+294:294-(16-16):2=1
(16-16):2=0:2=0
375*0=0
294:294=1
0+1-0=1
7:(15:15)-(21-2 1)*5+1*9=16
7:(15:15)=7:1=7
(21-21)*5=0*5=0
1*9=9
7-0+9=16
......................................
13 11/30-12 21/30=1 11/30-21/30=41/30-21/30=20/30=2/3