31×0.3-0.3x=6 2.4:=3.2:x
= 6x+2×1.5=21
1.2x-5.5=0.5 :x=3:16 9x+42=150
4x+6x=26 5×8+5x=80 x-4.9+2.1=10
x-= -x= x+=
8.7+x=25 x÷0.3=2.7 48x+ 52x=45 5x-6.8+3.2=10
2x+30%x=13.8 13:x=6.5:4
:x=: 2:=3.6:x 12-4x=2.4
76x=136.8 9.2+0.8x=11.6 7x+3x-25=73
6x-18=120 x÷9=12.6 *3.8x-x=0.56
x+18-25=43 27x+31x=145 7x-16×4=27
6×0.8+7x=19.5 x-0.8x=10 3.6x÷2=2.16