(x+3)/(1-x)<=1<br>(x+3-1+x)/(1-x)<=0<br>2(x+1)/(1-x)<=0<br>=======-1=========1========
------------ ++++++++= --------
x=(-oo -1)U[1 +oo)
--------------------------
!1-2x!>=8
1-2x>=8
2x<=-7<br>x<=-7/2<br>1-2x<=-8<br>2x>=9
x>=9/2
x=(-oo -7/2]U[9/2 +oo]