6x+3/2x=9
7.5x=9
x=9÷7.5
x=1.2
2x-4/3x=1/2
2/3x=1/2
x=1/2*3/2
x=3/4
x+9/2=12
x=12-9/2
x=7.5
x-0.8x=22
0.2x=22
x=22÷0.2
x=110