x:42=:5 4×(x-58.2)=16.8
①x+36=100
②0.3x+3.2×5=22
③0.35:35=x:6
0.8x+0.5×13=10.5 x∶(1-40%)=24∶3
4x﹣1=2.6
x:3.5=3:7
1.2:x=4:2.5
x21=57
8:x=7:0.5
3.2:0.2=x:38