[1]4x-3乘12=68
4x-36=68
4x=68+36
4x=104
x=26
[2]4.5乘4-3x=6.33
18-3x=6.33
-3x=6.33-18
-3x=-11.67
x=3.89
[3]2.5（x-3.7）=6.25
x-3.7=2.5
x=3.7+2.5
x=6.2
[1] 3.6x除1.2=9.759
3x=9.759
x=3.253
[2]3x减1.5x=30.6
1.5x=30.6
x=20.4
[3]7.2乘1.5减3x=1.2
10.8-3x=1.2
-3x=-9.6
x=3.2
[4]14*[36-x]=38
36-x=19/7
x=36-19/7
x=233/7
[4]14*[36-x]=28
36-x=2
x=34