解:(1)4-7.1+10x=5x+2.3
10x-5x=2.3+7.1-4
5x=5.4
x=1.08
(2)3(3x+1)+2.4=12x
3x+1+0.8=4x
x=1.8
(3)4x-3=3x-4+2x
4x=5x-4+3
x=1
(4)2(5x-9)=2x-2
2(5x-9)=2(x-1)
5x-9=x-1
x=2
(5)5(x+8)-5=6(2x-7)
5(x+8-1)=6(2x-7)
5x+35=12x-42
7x=77
x=11
5(x+8)-5=6(2x-7)
5x+40-5=12x-42
7x=77 x=11
2(5x-9)=2x-2
10x-18=2x-2
8x=16 x=2