7x+3.2=3x+6.4

7x+3.2=3x+6.4

7x+3.2=3x+6.4
7x-3x=6.4-3.2
4x=3.2
x=3.2÷4
x=0.8
祝你學習進步,有不明白的可以追問!謝謝!