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a)
4(2x2+3)>2x2-3
4x7>4-3
28>1
b)
2-8x2<-1/2(2-4)
2-16<-1/2x-2
-14<1
8x+12>2x-3
8x-2x>-3-12
6x>-15 /:6
x>-2½
np x=1
b) 2-8x<-½(x-4)
2-8x<-½x+2
-8x+½x<2-2
-7½x<0 /:-7½
x>0
np. x=2