x+4.8=7.2
x=7.2-4.8
x=2.4
x一6.5=3.2
x=3.2+6.5
x=9.7
x+2.4x=5.1
3.5x=5.1
x=5.1/3.5
x=51/35
x+0.3=1.8
x=1.8-0.3
x=1.5
x一1.5=4
x=4+1.5
x=5.5
3+x=5.4
x=5.4-3
x=2.4
x一6=7.6
x=7.6+6
x=13.6