x÷18=3.6
x=3.6*1.8
x=6.48
2x+3.4=9.6
2x=9.6-3.4
x=6.2/2
x=3.1
3x-6×12=24
3x=24+72
x=96/3
x=32
6.8x-0.8x=0.48
6x=0.48
x=0.48/6
x=0.08
5(16-x)=35
16-x=7
x=16-7
x=11