1) 6х+2 - х <=3x + 12<br>2x <= 10<br>x<= 5<br>2)7x + 4x - 8 > 6 + 18x
11x - 18x > 6+8
-7x>14
x<2<br>3) 2x - 2 - 3x-6 < 6 +6x
2x - 6x-3x<6+2+6<br>-7x<14<br>x>2
4)7y +21 - 2y-4 >= 10y+2
7y-2y-10y>2-21+4
-5y>-15
y<3<br>5)18+30y-2-7y<=20+15y<br>18-20-2<= 15y+7y-30y<br>-4<=-8y<br>y<=0.5<br>6) 12y - 4 - 3y + 3 > 6 +2y
12y-3y - 2y>6-3+4
y>7/9