5y+9<=3-7y<br>5y+7y<=3-9<br>12y<=-6<br>y<=-6/12<br>y<=-1/2<br>
3x+1<=4x-5<br>3x-4x<=-5-1<br>-x<=-6<br>x<=6<br>
1/4-y/3>=1/3-y
y-y/3>=1/3-1/4
(3y-y)/3>=(4-3)/12
2y/3>=1/12
2y>=3/12
2y>=1/4
y>=1/8
6y>3y-2
6y-3y>-2
3y>-2
y>-2/3
3-7y>5y-3
3+3>5y+7y
6>12y
y<6/12<br>y<1/2<br>
x/6+1/2>x-1/3
1/2+1/3>x-x/6
(3+2)/6>(6x-x)/6
5/6>5x/6
x<5/6*6/5<br>x<0