6x-3[3-2x]=6-[x+2]
6x-3*3+3*2x=6-x-2
12x-9=4-x
13x=13
x=1
【2】4分之3y+12=2-3分之5y-7
两边乘12
3(3y+12)=24-4(5y-7)
9y+36=24-20y+28
29y=16
y=16/29