(x-4.2)÷3=8x-4.2=8×3x=24+4.2x=28.2
x-4.2=8×3x=24+4.2x=28.4
解 X-4.2=24 X=24+4.2 X=28.2
(x－4.2)÷3＝8 x－4.2=24 x=28.2
19.8
