:=:x 0.8:40=x:80 :x = 30:120 =
3:x=9:15 35:67=x:54 x:3.6=3:2.7
23:x=512:34 4:1.25=x:0.75
6:x=15:12 4:0.3=x:16
4:8=x:24 14:x=15:12 56=35x
x:0.4=0.9:0.6 50:x=23:45 25x=5:8