12y-5=3(2y+1)
12y-5=6y+3
12y-6y=5+3
6y=8
y=4/3
1-6分之2x-5=4分之3-x 两边乘12
12-2（2x-5）=3(3-x)
12-4x+10=9-3x
4x-3x=12+10-9
x= 13