а) 4х+7<=6x+1
4x-6x<=1-7
-2x<=-6
2x>=6
x>=3
б) 4(1-х)+5(х+8)≥0
4-4x+5x+40≥0
-4х+5х≥-40-4
х≥-44
в)
2x-3x-10x>1/5+1/5
-11x>2/5
x<-2/5:11
x<-2/55
г)
6х^2-6x^2-12x>48
-12x>48
-x>4
x<-4
