7 1/4 - 3 7/15 = 7 15/60 - 3 28/16 = 6 75/60 - 3 28/60 = 3 47/60
(976:8)*(45:15):2=183
68:(17*2)*350:100=7
181*4:(76:38)+38=400
309:(2*405:9:30)=103
1)3-3х=1-4х+5х+10 2)7х+1-9х-3=5 3)-0.11х-0.08=5-100 4)5х-16х+3х=-0.4+6-4
-3х+4х-5х=1-3+10 7х-9х=5-1+3 -0.19х=-95 -8х=1.6
-4х=8 -2х=7 х=-95:-0.19 х=1.6:-8
х=8:-4 х=7:-2 х=500 х=-0.2
х=-2 х=-3.5