4x+3*0.7=6.5 95%x-2/5x=55 4x-1.6=36 4x+3*0.7=6.595%x-2/5x=554x-1.6=36

问题描述:

4x+3*0.7=6.5 95%x-2/5x=55 4x-1.6=36
4x+3*0.7=6.5
95%x-2/5x=55
4x-1.6=36