13十2.3(x一3)=8十(x一3)十0.8x
解:13+2.3X-6.9=8+X-3+0.8X
2.3X+6.1=1.8X+5
2.3X-1.8X=5-6.1
0.5x=-1.1
X=(-1.1)÷0.5
X=-2.2
13十2.3(x一3)=8十(x一3)十0.8x
13+2.3x-6.9=8+x-3+0.8x
2.3x+6.1=1.8x+5
2.3x-1.8x=5-6.1
0.5x=-1.1
x=-2.2