1) 3.3x-1.6+1.2x<=9.6+3.5-5x</p>
3.3x+1.2x+5x<=9.6+3.5+1.6</p>
9.5x<=14.7</p>
x<=147/95</p>
2) 4.5y+9-3.1+3.1y>5.9+7.2y
4.5y+3.1y-7.2y>5.9-9+3.1
0.4y>0
y>0
3) 0.6a-1.2-0.2>=0.8a+1.6+3.5
0.6a-0.8a>=1.6+3.5+1.2+0.2
-0.2a>=6.5
a<=-32.5</p>
4) -1.4+5.5b-1<-5.5b+1.6</p>
5.5b+5.5b<1.6+1.4+1</p>
11b<4</p>
b<4/11</p>