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2x - x-1/4<3x-1/2+x
2x-x-3x-x<-1/2+1/4
-3x<-1/4 / -3
x>3/4
f)
2x+1/4 - x ≥ 1-x/2
2x-x+x/2 ≥1-1/4
1.5x ≥3/4 /1.5
x≥0,5