8.4-0.6*(X+2)=3*(0.2X-2.4)
解:8.4-0.6×X-0.6×2=3×0.2X-3×2.4
8.4-0.6X-1.2=0.6X-7.2
7.2-0.6X=0.6X-7.2
0.6X+0.6X=7.2+7.2
1.2X=14.4
X=14.4÷1.2
X=12
8.4-0.6×(x+2)=3×(0.2x-2.4)
8.4-0.6x-1.2=0.6x-7.2
7.2-0.6x=0.6x-7.2
1.2x=7.2+7.2
1.2x=14.4
x=14.4÷1.2
x=12
8.4-0.6X-1.2=0.6X-7.2
0X=0
X=0