6.6-x=2.1 x:=: 60%x+1.5=x+6.5
3x+6=12.6 :x=:
3x﹣1.5x=22.5
x:0.8=0.25:
1+x=
= 1.8:5.4=x:2.4 x:8=:
x﹣20%x=40 5x+18=48 :=15:x
7.2:x=
解:3.6x=57.6
3.6x÷3.6=57.6÷3.6
x=16