x+0.25x=12.5
8.4-3x= 2.7
☆2x+0.6=1.08
①x+1.75=3.4
②9x=0.27
③x-2.08=4.25
④x÷1.2=1.2
①0.4x=3.6
②x﹣x=70
③1.6:x=0.8:0.4
④=