3.9x-18.6=25.5-x、和2x加26=5x-13这两题怎么做?

3.9x-18.6=25.5-x、和2x加26=5x-13这两题怎么做?
3.9x-18.6=25.5-x、和2x加26=5x-13这两题怎么做?

3.9x-18.6=25.5-x、和2x加26=5x-13这两题怎么做?
3.9x-18.6=25.5-x
移项 3.9x+x=18.6+25.5
4.9x=44.1
x=9
2x+26=5x-13
移项5x-2x=26+13
3x=39
x=13