①5.6x-8.6=19.4
5.6x-8.6+8.6=19.4+8.6
5.6x=28
x=5;
②3.2x-1.5x=0.51
1.7x=0.51
1.7x÷1.7=0.51÷1.7
x=0.3;
③(x+0.3)÷2=7.15
(x+0.3)÷2=7.15
(x+0.3)×
1
2 ×2=7.15×2
x+0.3-0.3=14.3-0.3
x=14.
①5.6x-8.6=19.4
5.6x-8.6+8.6=19.4+8.6
5.6x=28
x=5;
②3.2x-1.5x=0.51
1.7x=0.51
1.7x÷1.7=0.51÷1.7
x=0.3;
③(x+0.3)÷2=7.15
(x+0.3)÷2=7.15
(x+0.3)×
1
2 ×2=7.15×2
x+0.3-0.3=14.3-0.3
x=14.