a, 2./x+2/-4.(x+1)=2.(x-3)-/x+2/+1
<=>2.x+2-4(x+1)=2.(x+3)-x+3+1
<=>2x+2-4x-4=2x-6-x+2+1
<=>2x-4x-2x+x=-2-6+2+1
<=>-3x= -5
<=>x=5/3
b, 2./x+2/ +3=x+1
<=>2.x+2+3=x+1
<=>2x+2+3=x+1
<=>2x-x=-2-3+1
<=>x=-4
c, 4. [(x+2).3-2]+6=x+2
<=>4.[3x+6-2] +6=x+2
<=>4.[3x+4]+6=x+2
<=>12x+16=x+2
<=>12x-x=-16+2
<=>11x=-14
<=>x=-14/11
d, 2. [2(x-2)-3(x+1)] -1=x+1
<=>2.[2x-4-3x-3]-1=x+1
<=>2.[-x-7]-1=x+1
<=>-2x-14-1=x+1
<=>-2x-x=14+1+1
<=>-3x=16
<=>x=-16/3