1.2x+3.4=9.6
2x=9.6-3.4
2x=6.2
x=6.2÷2
x=3.1
2.3x-6×12=24
3x=72+24
3x=96
x=96÷3
x=32
3.6.8x-0.8x=0.48
6x=0.48
x=0.48÷6
x=0.08
4.5(16-x)=35
16-x=35÷5=7
x=16-7
x=9