1.2+2x=6.4+21.2+2x=8.41.2+2x-1.2=8.4-1.2 2x=7.2 2x÷2=7.2÷2 x=3.6
1.2+2X=6.4÷2 2X=6.4÷2 2X=3.2-1.2 2X=2 X=1
采纳必答